I got 74 marks in JEE Mains and 89% in state board. Should I drop an year? Can you suggest any college for computer science engineering?

Vishvajeet !answer this question would be tough as it totally a personal decision.in my opinion,you must go for some premier private institute that are doing exceptionally well.They along with good education provides an assured placements.so why to waste an year when you can invest that time i resea