JEE

yeah bit Mesa is a good college and you can opt it.
But what exactly do you want .can you specify your question clearly?

hmm you can try for Amrita .also you can try for RVCE Bangalore and there are some good local colleges .

Getting into MIT Pune with this score is not possible

Dont worry if you haven't done well in JEE mains,there are still many colleges who conducts their own entrance examination and provides high scholarship based on that score.These colleges are doing equally good as top Government institutions.You can prepare and can give their examination to avail the seat at high scholarship.here are some of the colleges where you can get admission:
1.Lovely Professional University
2.BITS
3.Symbiosis
These universities not only provide good education but also provides assured placement in top MNCs.

wait for an year and try to get more marks in jee mains for better placement

Check out the following link :
https://www.resonance.ac.in/jee-main-answer-key-solutions/jee-main-2016-rank-predictor.php

its not compulsary to give jee advance and advance score gets u admission in IITS and mains score takes u to NITS and other clgs and there is not affect on ur mains score if u dont give advance. but according to me u should try it.

Check the links below for rank and colleges:
https://www.resonance.ac.in/jee-main-answer-key-solutions/jee-main-2016-rank-predictor.php
https://www.shiksha.com/jee-mains-college-predictor

Concentrate first to complete 11th and 12th NCERT. After that you can continue your practice by solving R. S. Agarwal , Arihant , and also if possible try to get practice material from leading test preparation institutions. But one thing make sure that whichever book you pick , try to solve each and every problem of it from each and every topic.
All the best.
Hope it helps.