Engineering Entrance Exam

Yes, you can get a seat in VSSUT happily. By looking at last year stats i.e. 2017, girls having ranks of 2lakhs in JEE mains have got mechanical engineering branch in VSSUT, so it might not be difficult for you to get a seat in VSSUT, as you have secured a good rank.

I am enlisting top colleges with their fee structure:
Centre For Environmental Planning & TechnologyAhmedabad-1,61,000
Lovely Professional University - 19500
Jadavpur UniversityKolkata-2,730
School of Planning and Architecture Delhi-46,300
NIMS UniversityJaipur-1,11,000
Sir J. College Of ArchitectureMumbai-17,800
Indian Institute of TechnologyKharagpur-74,000
National Institute of TechnologyThiruchirapalli-39,400
Jamia Millia IslamiaNew Delhi-64,500
Manipal UniversityManipal-3,04,000

Go to Kotak or Indore otherwise Delhi will be good option for preparation of IIT-JEE. These cities have good atmosphere for study.

Check out Shiksha college predictor for better information of all your possibilities.

Yes, GATE is quite important exam as a good score not only ensures your admission in IITs but also gives you a chance to get into PSUs.

No, you won't get CSE in Heritage. Try for other branches.

I guess 70% is good enough to GET admission in some good private engineering colleges. It would be a waste of time to give improvement in 12th and it's not even known that the aggregate would improve or not. If you give improvement, it would take another year, which is why it's better to try out some other engineering colleges.

My score : 208,AIR-12381,OBC NCL-3404