Engineering

Basics are very important part of anything and when it comes to computer Science engineering I will suggest that you should have good command over class 11th and class 12th maths and physics, because this is very important for your first year and if you want to study something before you start your college then undoubtedly I will say start practicing basics of programming like c, python and Java from online websites like Coursera or edx (courses on both these websites are free of cost and from reputed colleges like Stanford university, Microsoft etc. )these surely will help you very much in the 2nd ,3rd and 4th year and don't take much pressure college life can some time get pretty hectic so the time you are having with you right now enjoy it as much you can because once you are in college you will have the realization things don't work the way they used to before. In the last my only tip is that practice Maths and physics and basic C, Python and Java that's all.