Dear Aspirant,
2nd year is the time when student face their core branch subjects and it is the high time when you need to take a crucial decision regarding what do you really want to do :-
1. Your first prority should be understand your core subjects.
2. If you're really passionate with your CSE then you should choose one particular programming language and start learning it and try to be master in that language.
3. For CSE students DSA is must, so you should also learn it.
4. You should also start practicing Aptitude.
5. If you really like CSE then GATE should be your firat priority.
6. If you're interested in management then start preparing for the CAT.
7. And utmost important thing is that you should learn TIME MANAGEMENT.
Hope this helps.
And all the best for your future.