I am not getting any good college this year as my uptu and jee main ranking is not good. Should I drop one year for preparation again?

Dear Kanika, To be honest, it will be difficult to get a good institute with the above mentioned scores; and as a friend, I would suggest you to try again next year (If possible). In fact many students this year, re-appeared as they couldn't clear JEE Advance last year. But if possible, do try an