Hello,

engineering college is a place where you will learn many new things with study. Although there are many apps but as per my suggestion don't depend on any e-learning apps just go watch videos lectures and many more.

still you want then you can have coursera, udemy as your guide.

Hey dear, i understand your state of mind being a fresher in college. To start you academic journey in college for a good cgpa you need to focus basically on notes given by the teacher and the basics of every topic.And if you want to have online learning for gate exam you can take help of unacademy from youtube, it is worth preparing for exams like gate.