diff --git a/implement-and-rewrite-tests/implement-tests-with-node-test/1-get-angle-type.test.js b/implement-and-rewrite-tests/implement-tests-with-node-test/1-get-angle-type.test.js
index cf50f6cad..89c99f892 100644
--- a/implement-and-rewrite-tests/implement-tests-with-node-test/1-get-angle-type.test.js
+++ b/implement-and-rewrite-tests/implement-tests-with-node-test/1-get-angle-type.test.js
@@ -6,7 +6,51 @@ import { getAngleType } from "../implement/1-get-angle-type.js";
 // TODO: Write tests to cover all cases, including boundary and invalid cases.
 // Example: Identify Right Angles
 
-test("Classifies right angles", () => {
+test("returns right angle for 90", () => {
   const right = getAngleType(90);
   assert.equal(right, "Right angle");
 });
+
+test("returns invalid angle for 0", () => {
+  const result = getAngleType(0);
+  assert.equal(result, "Invalid angle");
+});
+
+test("returns acute angle for 1", () => {
+  const result = getAngleType(1);
+  assert.equal(result, "Acute angle");
+});
+
+test("returns acute angle for 89", () => {
+  const result = getAngleType(89);
+  assert.equal(result, "Acute angle");
+});
+test("returns obtuse angle for 91", () => {
+  const result = getAngleType(91);
+  assert.equal(result, "Obtuse angle");
+});
+
+test("returns obtuse angle for 179", () => {
+  const result = getAngleType(179);
+  assert.equal(result, "Obtuse angle");
+});
+
+test("returns straight angle for 180", () => {
+  const result = getAngleType(180);
+  assert.equal(result, "Straight angle");
+});
+
+test("returns reflex angle for 359", () => {
+  const result = getAngleType(359);
+  assert.equal(result, "Reflex angle");
+});
+
+test("returns invalid angle for 360", () => {
+  const result = getAngleType(360);
+  assert.equal(result, "Invalid angle");
+});
+
+test("returns invalid angle for -1", () => {
+  const result = getAngleType(-1);
+  assert.equal(result, "Invalid angle");
+});
diff --git a/implement-and-rewrite-tests/implement-tests-with-node-test/2-is-proper-fraction.test.js b/implement-and-rewrite-tests/implement-tests-with-node-test/2-is-proper-fraction.test.js
index a29084605..5f1e43d70 100644
--- a/implement-and-rewrite-tests/implement-tests-with-node-test/2-is-proper-fraction.test.js
+++ b/implement-and-rewrite-tests/implement-tests-with-node-test/2-is-proper-fraction.test.js
@@ -10,3 +10,31 @@ test("Basic proper fraction", () => {
   // Example: 1/2 is a proper fraction
   assert.equal(isProperFraction(1, 2), true);
 });
+
+test("returns true for -1 and -2", () => {
+  assert.equal(isProperFraction(-1, -2), true);
+});
+
+test("returns true for zero numerator", () => {
+  assert.equal(isProperFraction(0, 5), true);
+});
+
+test("returns false for zero denominator", () => {
+  assert.equal(isProperFraction(1, 0), false);
+});
+
+test("returns true for negative numerator and positive denominator", () => {
+  assert.equal(isProperFraction(-1, 2), true);
+});
+
+test("returns true for positive numerator and negative denominator", () => {
+  assert.equal(isProperFraction(1, -2), true);
+});
+
+test("returns false for equal numerator and denominator", () => {
+  assert.equal(isProperFraction(-2, 2), false);
+});
+
+test("returns false when absolute numerator is greater than denominator", () => {
+  assert.equal(isProperFraction(-3, 2), false);
+});
diff --git a/implement-and-rewrite-tests/implement-tests-with-node-test/3-get-card-value.test.js b/implement-and-rewrite-tests/implement-tests-with-node-test/3-get-card-value.test.js
index f5092d9b1..825fa56e4 100644
--- a/implement-and-rewrite-tests/implement-tests-with-node-test/3-get-card-value.test.js
+++ b/implement-and-rewrite-tests/implement-tests-with-node-test/3-get-card-value.test.js
@@ -3,14 +3,49 @@ import test from "node:test";
 
 import { getCardValue } from "../implement/3-get-card-value.js";
 
-// TODO: Write tests to cover all outcomes, including throwing errors for invalid cards.
-
 test("Valid single-digit card", () => {
   assert.equal(getCardValue("9♠"), 9);
 });
 
 test("Arbitrary non-card string", () => {
-  assert.throws(() => getCardValue("invalid"), /Expected a number followed by a suit, but got "invalid"/, "Expected clear error");
+  assert.throws(
+    () => getCardValue("invalid"),
+    /Invalid suit: "d"/,
+    "Expected clear error"
+  );
+});
+
+test("return 11 for an ace in every suit", () => {
+  const suits = ["♠", "♥", "♦", "♣"];
+
+  for (const suit of suits) {
+    assert.equal(getCardValue(`A${suit}`), 11);
+  }
+});
+
+test("returns 10 for face cards in every suit", () => {
+  const faceCards = ["J", "Q", "K"];
+  const suits = ["♠", "♥", "♦", "♣"];
+
+  for (const rank of faceCards) {
+    for (const suit of suits) {
+      assert.equal(getCardValue(`${rank}${suit}`), 10);
+    }
+  }
 });
 
-// TODO: What other invalid card cases can you think of?
+test("returns the correct value for number cards", () => {
+  const numberCards = ["2", "3", "4", "5", "6", "7", "8", "9", "10"];
+
+  for (const rank of numberCards) {
+    assert.equal(getCardValue(`${rank}♣`), Number(rank));
+  }
+});
+
+test("throws an error for an invalid suit", () => {
+  assert.throws(() => getCardValue("9X"));
+});
+
+test("throws an error for an invalid rank", () => {
+  assert.throws(() => getCardValue("1♣"));
+});
diff --git a/implement-and-rewrite-tests/implement/1-get-angle-type.js b/implement-and-rewrite-tests/implement/1-get-angle-type.js
index 8a6fba050..928be482b 100644
--- a/implement-and-rewrite-tests/implement/1-get-angle-type.js
+++ b/implement-and-rewrite-tests/implement/1-get-angle-type.js
@@ -17,5 +17,22 @@
 // execute the code to ensure all tests pass.
 
 export function getAngleType(angle) {
-  // TODO: Implement this function
+  if (angle <= 0 || angle >= 360) {
+    return "Invalid angle";
+  }
+
+  if (angle < 90) {
+    return "Acute angle";
+  }
+  if (angle === 90) {
+    return "Right angle";
+  }
+  if (angle < 180) {
+    return "Obtuse angle";
+  }
+
+  if (angle === 180) {
+    return "Straight angle";
+  }
+  return "Reflex angle";
 }
diff --git a/implement-and-rewrite-tests/implement/2-is-proper-fraction.js b/implement-and-rewrite-tests/implement/2-is-proper-fraction.js
index f983800f0..91194267d 100644
--- a/implement-and-rewrite-tests/implement/2-is-proper-fraction.js
+++ b/implement-and-rewrite-tests/implement/2-is-proper-fraction.js
@@ -14,5 +14,5 @@
 // execute the code to ensure all tests pass.
 
 export function isProperFraction(numerator, denominator) {
-  // TODO: Implement this function
+  return Math.abs(numerator) < Math.abs(denominator);
 }
diff --git a/implement-and-rewrite-tests/implement/3-get-card-value.js b/implement-and-rewrite-tests/implement/3-get-card-value.js
index 9614ab1ee..cba655825 100644
--- a/implement-and-rewrite-tests/implement/3-get-card-value.js
+++ b/implement-and-rewrite-tests/implement/3-get-card-value.js
@@ -24,5 +24,28 @@
 // execute the code to ensure all tests pass.
 
 export function getCardValue(card) {
-  // TODO: Implement this function
+  if (typeof card !== "string" || card.length < 2) {
+    throw new Error(`Invalid card: "${card}"`);
+  }
+
+  const rank = card.slice(0, -1);
+  const suit = card.slice(-1);
+
+  if (!["♠", "♥", "♦", "♣"].includes(suit)) {
+    throw new Error(`Invalid suit: "${suit}"`);
+  }
+
+  if (rank === "A") {
+    return 11;
+  }
+
+  if (["J", "Q", "K"].includes(rank)) {
+    return 10;
+  }
+
+  if (["2", "3", "4", "5", "6", "7", "8", "9", "10"].includes(rank)) {
+    return Number(rank);
+  }
+
+  throw new Error(`Invalid rank: "${rank}"`);
 }
diff --git a/practice-tdd/count.js b/practice-tdd/count.js
index 5518c5712..0b461dfd4 100644
--- a/practice-tdd/count.js
+++ b/practice-tdd/count.js
@@ -1,3 +1,10 @@
 export function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  let count = 0;
+
+  for (const character of stringOfCharacters) {
+    if (character === findCharacter) {
+      count++;
+    }
+  }
+  return count;
 }
diff --git a/practice-tdd/count.test.js b/practice-tdd/count.test.js
index cb3aaae59..355944b99 100644
--- a/practice-tdd/count.test.js
+++ b/practice-tdd/count.test.js
@@ -22,3 +22,8 @@ test("should count multiple occurrences of a character", () => {
 // And a character `char` that does not exist within `str`.
 // When the function is called with these inputs,
 // Then it should return 0, indicating that no occurrences of `char` were found.
+
+test("should return 0 when character does not occur", () => {
+  const count = countChar("hello", "z");
+  expect(count).toEqual(0);
+});
diff --git a/practice-tdd/get-ordinal-number.js b/practice-tdd/get-ordinal-number.js
index 5c6291f5e..fb702b33e 100644
--- a/practice-tdd/get-ordinal-number.js
+++ b/practice-tdd/get-ordinal-number.js
@@ -1,3 +1,16 @@
 export function getOrdinalNumber(num) {
-  return "1st";
+  const lastTwoDigits = num % 100;
+  const lastDigits = num % 10;
+
+  if (lastTwoDigits >= 11 && lastTwoDigits <= 13) {
+    return `${num}th`;
+  } else if (lastDigits === 1) {
+    return `${num}st`;
+  } else if (lastDigits === 2) {
+    return `${num}nd`;
+  } else if (lastDigits === 3) {
+    return `${num}rd`;
+  } else {
+    return `${num}th`;
+  }
 }
diff --git a/practice-tdd/get-ordinal-number.test.js b/practice-tdd/get-ordinal-number.test.js
index e23174a18..9a48f7921 100644
--- a/practice-tdd/get-ordinal-number.test.js
+++ b/practice-tdd/get-ordinal-number.test.js
@@ -18,3 +18,27 @@ test("should append 'st' for numbers ending with 1, except those ending with 11"
   expect(getOrdinalNumber(21)).toEqual("21st");
   expect(getOrdinalNumber(131)).toEqual("131st");
 });
+
+test("should append 'nd' for numbers ending with 2, except those ending with 12", () => {
+  expect(getOrdinalNumber(2)).toEqual("2nd");
+  expect(getOrdinalNumber(22)).toEqual("22nd");
+  expect(getOrdinalNumber(112)).toEqual("112th");
+});
+
+test("should append 'rd' for numbers ending with 3, except those ending with 13", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+  expect(getOrdinalNumber(23)).toEqual("23rd");
+  expect(getOrdinalNumber(113)).toEqual("113th");
+});
+
+test("should append 'th' for other numbers", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(24)).toEqual("24th");
+  expect(getOrdinalNumber(114)).toEqual("114th");
+});
+
+test("should append 'th' for numbers ending with 11, 12, 13", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(13)).toEqual("13th");
+});
diff --git a/practice-tdd/repeat-str.js b/practice-tdd/repeat-str.js
index af273f3b0..771ec82fe 100644
--- a/practice-tdd/repeat-str.js
+++ b/practice-tdd/repeat-str.js
@@ -1,5 +1,10 @@
-export function repeatStr() {
-  // Your implementation of this function must *not* call String.prototype.repeat (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat).
-  // The goal is to re-implement that function, not to use it.
-  return "hellohellohello";
+export function repeatStr(str, count) {
+  if (count < 0) {
+    throw new Error("Count cannot be negative");
+  }
+  let result = "";
+  for (let i = 0; i < count; i++) {
+    result += str;
+  }
+  return result;
 }
diff --git a/practice-tdd/repeat-str.test.js b/practice-tdd/repeat-str.test.js
index 8a7036102..895133fb8 100644
--- a/practice-tdd/repeat-str.test.js
+++ b/practice-tdd/repeat-str.test.js
@@ -16,6 +16,20 @@ test("should repeat the string count times", () => {
   expect(repeatedStr).toEqual("hellohellohello");
 });
 
+test("should return the original string when count is 1", () => {
+  const str = "hello";
+  const count = 1;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("hello");
+});
+
+test("should return an empty string when count is 0", () => {
+  const str = "hello";
+  const count = 0;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("");
+});
+
 // Case: handle count of 1:
 // Given a target string `str` and a `count` equal to 1,
 // When the repeatStr function is called with these inputs,