diff --git a/practice-tdd/count.js b/practice-tdd/count.js
index 5518c5712..6167d6444 100644
--- a/practice-tdd/count.js
+++ b/practice-tdd/count.js
@@ -1,3 +1,3 @@
 export function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  return stringOfCharacters.split(findCharacter).length - 1;
 }
diff --git a/practice-tdd/count.test.js b/practice-tdd/count.test.js
index cb3aaae59..0575330cc 100644
--- a/practice-tdd/count.test.js
+++ b/practice-tdd/count.test.js
@@ -22,3 +22,10 @@ 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 count multiple occurrences of a character", () => {
+  const str = "aaaaa";
+  const char = "b";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
diff --git a/practice-tdd/get-ordinal-number.js b/practice-tdd/get-ordinal-number.js
index 5c6291f5e..2610dc26c 100644
--- a/practice-tdd/get-ordinal-number.js
+++ b/practice-tdd/get-ordinal-number.js
@@ -1,3 +1,23 @@
 export function getOrdinalNumber(num) {
-  return "1st";
+  const numStr = num.toString();
+  const numLength = numStr.length;
+  const pattern1 = /^(11|12|13)$/;
+  const pattern2 = /^0$/;
+  const pattern3 = /^(4|5|6|7|8|9)$/;
+  const last2digits = numStr.slice(-2);
+  const last1digit = numStr.slice(-1);
+
+  if (numStr[numLength - 1] == "1" && numStr[numLength - 2] != "1") {
+    return `${numStr}st`;
+  } else if (numStr[numLength - 1] == "2" && numStr[numLength - 2] != "1") {
+    return `${numStr}nd`;
+  } else if (numStr[numLength - 1] == "3" && numStr[numLength - 2] != "1") {
+    return `${numStr}rd`;
+  } else if (
+    pattern1.test(last2digits) ||
+    pattern2.test(last1digit) ||
+    pattern3.test(last1digit)
+  ) {
+    return `${numStr}th`;
+  }
 }
diff --git a/practice-tdd/get-ordinal-number.test.js b/practice-tdd/get-ordinal-number.test.js
index e23174a18..2129d3efb 100644
--- a/practice-tdd/get-ordinal-number.test.js
+++ b/practice-tdd/get-ordinal-number.test.js
@@ -18,3 +18,21 @@ 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(132)).toEqual("132nd");
+});
+
+test("should append 'rd' for numbers ending with 3, except those ending with 13", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+  expect(getOrdinalNumber(33)).toEqual("33rd");
+  expect(getOrdinalNumber(143)).toEqual("143rd");
+});
+
+test("should append 'th' for numbers ending with [0][4-9] and [11-13]", () => {
+  expect(getOrdinalNumber(111)).toEqual("111th");
+  expect(getOrdinalNumber(120)).toEqual("120th");
+  expect(getOrdinalNumber(134)).toEqual("134th");
+});
diff --git a/practice-tdd/repeat-str.js b/practice-tdd/repeat-str.js
index af273f3b0..e6393e171 100644
--- a/practice-tdd/repeat-str.js
+++ b/practice-tdd/repeat-str.js
@@ -1,5 +1,12 @@
-export function repeatStr() {
+export function repeatStr(word, n) {
   // 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";
+  if (n >= 0) {
+    let nWords = "";
+    for (let i = 0; i < n; i++) {
+      nWords = nWords + word;
+    }
+    return nWords;
+  }
+  throw new Error("Error");
 }
diff --git a/practice-tdd/repeat-str.test.js b/practice-tdd/repeat-str.test.js
index 8a7036102..3347b54f8 100644
--- a/practice-tdd/repeat-str.test.js
+++ b/practice-tdd/repeat-str.test.js
@@ -21,12 +21,34 @@ test("should repeat the string count times", () => {
 // When the repeatStr function is called with these inputs,
 // Then it should return the original `str` without repetition.
 
+test("should repeat the string one time", () => {
+  const str = "hello";
+  const count = 1;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("hello");
+});
+
 // Case: Handle count of 0:
 // Given a target string `str` and a `count` equal to 0,
 // When the repeatStr function is called with these inputs,
 // Then it should return an empty string.
 
+test("should return empty string if count is zero", () => {
+  const str = "hello";
+  const count = 0;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("");
+});
+
 // Case: Handle negative count:
 // Given a target string `str` and a negative integer `count`,
 // When the repeatStr function is called with these inputs,
 // Then it should throw an error, as negative counts are not valid.
+
+test("should throw an error when count is negative integer", () => {
+  const str = "hello";
+  const count = -5;
+  expect(() => {
+    repeatStr(str, count);
+  }).toThrow("Error");
+});