Colleges in Gujarat

Kindly go through the below link for colleges in Gujarat: https://www.shiksha.com/b-tech/colleges/b-tech-colleges-Gujarat

Yes, you can easily get admission in this college at this score but getting CSE might be difficult.

Yes, Nirma University is a good option if you want to study in Gujarat.

You can choose Kanpur Institute of Technology as you will get good facilities here. They provide good placement too. You can apply for admission
Good luck.

Yes, you can get admission through LEET. There's an application form. You can google it and fill in the details over there.

I think you should take the seat and pursue it in spite of taking a year drop. Every single academic year is very important, so don't take risk of taking a drop. Second thing, it will be a quite better option than Nirma University. Do anything but don't go for a drop.