Engineering

Yes, you are elegible for it and you'll easily get CSE or your desired branch in it. Best of luck.

No, you can get admitted to IIT if you clear JEE Advanced and You get to sit in Advanced only if you clear Mains. If you failed to get in Mains, you will not be able to move further in the process.

Not, likely. You may get into lower NITs such as NIT Pondicherry and NIT Manipur. Choose them if you find them worthy. Else, chances are less with decent branch.

No, you cant get admission in Dr Ambedkar College in this rank. But you can try in other different colleges.

Please specify the entrance test in which you secured this rank so that I may be able to populate relevant details regarding your eligibility for admission to various colleges. Regards.

You will likely GET ECE in one of the NITs such as of Jaipur, Surat, Silchar, Bhopal and Nagpur. You may also get chemical in Warangal and mining in Surathkal. For CSE also, you can try the first four NIT out of which, NIT Jaipur is most likely. Best of luck.