My problem is activity in Universit

My problem is activity in University.
I always go to help my friend when i have free time.
ฺBut over time.They have not enough people.
They want someone who help their work.
If i say no.It maybe happen to friendship.
It make me haven't time to read a book.
After activity 2 last week exam-Midterms.

My solution is if my grad is down more than previous grade.I will not help their activity unless I finish read a book.But I should read a book atleast 1 month because I am learner slowly.