IIT

Engage Publication is for JEE Mains level and other equivalent examinations. Do not rely on either of the books for examinations like JEE Advance. For Advance level you can refer ML Khanna. Its question bank is very good. Refer IIT mathematics by Das Gupta. It is the most important book recommended by many teachers. If you want more questions and that too of good level then refer FIITJEE notes.

Chandigarh University
Lovely Professional University
Amity University
These are the best colleges for aerospace engineering except IITs.

Chemical Engineering is such a branch of engineering that it is offered only in selected top institutes in India. All IITs are good for it, especially old IITs such as IIT Madras, IIT Bombay, IIT Delhi and IIT Kanpur. Many top researchers and professors in Chemical Engineering are born in these institutes. Being a backbone of all fields, good exposure to courses and experiments is essential for becoming a good Chemical Engineer which is offered in IITs. Best Chemical engineering college in India:
IIT Bombay,
IIT Delhi,
IIT Kanpur,
IIT Kharagpur.

Hi Vaibhav,
I am not giving the ranking, but just giving the best of engineering colleges in India apart from IITs. These colleges are as follows:
NIT Warangal, NIT Trichy, DTU (Delhi Technological University), BITS Pilani, VNIT Nagpur, College of Engineering Pune (COEP), PICT Pune, Institute of Chemical Technology (ICT) Mumbai, VJTI Mumbai, SP College Mumbai, BITS Mesra.

No dear,
For IIT, you must be in the top 20 percentile of boards and as far as I know for RBSE board, you should have above 75%.
After that, you have to crack JEE Mains and JEE Advanced paper to get into an IIT.

Yes, try for NITs.

No, but its easier there and we had Thapar, VIT, BITS, Nirma, etc.

If you are getting chemical at old iits I would say go for it. Old IITs (Delhi, Mumbai, Chennai, Kanpur, Roorkee, Kharagpur, Guwahati), else compare each IIT placement and MNNIT placement then choose accordingly.

Well, that's not possible, 64.61% can not rounded off to 65% because there will be lot of students in between 64.61 and 65%.
For more details, contact the JEE conducting authority:
https://jeemain.nic.in/WebInfo/Public/View.aspx?page=78