Engineering

Yes, if you want to take the re-exam for MHCET, you can apply and get a good college like BE/B.Tech. Only thing is that you have achieved good marks in MHCET, but the college doesn't matter for your education and whatever you learn the only thing is what is skills you possess. So, think about this a

Computer Science has more chances of placements but it has very tough competition. Very less people opt for mining engineering so job opportunities are also good there.

ABCL/c+ uses asynchronous message passing among objects to achieve concurrency. It requires Common Lisp. Implementations in Kyoto Common Lisp (KCL) and Symbolics Lisp are available from the author. Python manages dynamic type system and automatic memory management.

Please firstly find that you are qualified or not in your respective category .
also if you have scored more than the cutoff marks that is from big margin then only you can get the college. https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor
please use the above link for the predictio

There is very less chances to get in JSS but you can try in any other college or KIET. I am sure that you can get mechanical.

If your category is general and OBC, don't waste time for IIT or NIT, if you want to drop a year, you can select a state level college.

Yes, definitely, you are eligible for JEE Advance for your score of 49 in OBC category. Also, you can check the list of college you can get according to your marks and rank here if you don't go for advnace. Use Shiksha JEE College Predictor:
https://www.shiksha.com/b-tech/resources/jee-mains-college

You can check your chances of getting NITs from this link. This is Shiksha's official college predictor tool. https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=cconnect&utm_medium=CR_JEECP&utm_campaign=6375912.