exam >= 90 is also wrong in your code. As well as several other conditions, check them all again.

If it's not difficult for you, then could you tell us which tests give the wrong answer for projects > 10 and projects >= 10.

100, if a grade for the exam is more than 90 or if a number of completed projects more than 10.

exam = 0, projects = 10: expected 100 to equal +0

Obviously with exam = 0 and projects = 10 neither of those conditions is true. The same with exam = 32.

Check the conditions and the operators you're using. 10 isn't more than 10.