Hello Hina,
Did you assign the free tests for your son to do or did you let him do the questions whilst using the ‘browse’ feature for these free tests?(This is done by using the eye icon on the test list.)
The browse function allows all the answers to be viewable because it designed for parents/tutors to look at beforethey assign the actual tests for a child to do.
Please will you let us know as the correct answers should not be viewable to a child taking any of the exercises/tests – thank you.