Indian Institute of Technology, IIT Bombay

The last year's closing rank at IIT-B in Chemical Engineering in General Neutral gender and PWD category was 123, which is equal (approximately) to 265 Marks.

IIT Bombay, IIT Kharagpur and IIST Trivandrum are offering B.Tech in aerospace engineering course. The admission in IITs and IIST are based on ranks obtained in JEE Advanced conducted among the JEE Mains qualifiers. Hence, first you have to qualify the JEE Main exam and then appear in JEE Advanced exam and obtained the minimum ranks as mentioned below:
IIT-B : 2082
IIT K : 3822
IIST : 11215
The best approach is to join any JEE preparation coaching institutes. Because more than 90% of students get selected in IITs are coming from the coaching centers.

GATE score (normalized) of admitted students in M.Tech Chemical Engineering at IIT Bombay in asked category was 568. So, you can estimate here yourself.
All the best

Shifting is not possible. You can apply as fresh candidate.

Hello,
It is very nice to hear from you that you are aiming for admission in Mumbai IIT for CSE. This means you would be almost in top 50 or 100 of JEE advanced. In view of this I do not see any hindrance of you not getting admission 4 years later in IIT Hyderabad for your MTech. But then nobody can predict as to what will be the situation and scheme of things for admission in mtech 4 years down the line. But, normally speaking yes you should get admission.
Best wishes to you.

For undergaduate course in Designing (B.Design) IIT Bombay accept UCEED Score while for postgraduate degree (M.Des) it accept CEED Score.