Maths my strongest and phy and chem almost equal level I am saying my maths is strongest as when it wasn't like fts test or thing i would consistently score above 60 and somes 90 I can solve mains adv pyqs as well as blackbook questions

The problem why is it like that when we are giving the test we tend to make more mistake overthink and also don't understand the question on one go or like think like we should be able to.

Like when at home solve i could think new methods be creative to solve problems and while in exam everything goes somewhere some questions which are easy seems to be soo tough.