suggest me some apps or books or papers
Purchase local writer books for all the subjects for better understanding...If you are in UPTU(now AKTU)B.tech 1st year then you don't have to take too much pressure on yourself as if you have attended most classes with a fair concentration then you can easily score good marks. And as the high time has come leave everything and try to follow last 5 year question papers of AKTU and try to make a concept of them instead of just mugging them up. And try to solve all the assignments given by the faculty as they will act as question bank for you..