Duvidha me hu

I'm not scoring good in physics. scoring good in bio and average in chemistry but in physics it's below average, not even 50%. somewhere i know that the reason is not practicing enough questions. i have solved module for few chapters only. the problem is i get highly demotivated when I get questions wrong, i feel overwhelmed. it's like I'm scared of practicing question ,i dont know how to explain it.

what do I do??