R.V. College of Engineering

Yes, you will get a seat in R.V college.

Tuition fees at Manipal is very high. Than RVCE. RVCE's CSE is about 8-9. LPA. MIT's CSE AVG package is 4-5 LPA. For CSE, RVCE would be good.

Hi, with this rank, it is very difficult to get into these colleges, which you have mentioned. But, you can try for payment seat.

Not compulsorily rather, you need to have biology as a compulsory subject for pursuing biotechnology.
But the criteria could differ from college to college. Some may ask for maths as an addition but not compulsion. So you can go for biotechnology even if didn't have maths.
P.S: Choose a college very carefully. Placements are rather important.
Good luck!

You might have a chance if you have any reservation criteria else give it a try. You have very great chances to get into this institute with this rank.
Attend the counselling and choose your options appropriately.

Enter your score and check here:
https://www.google.co.in/url?sa=t&source=web&rct=j&url=https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor&ved=2ahUKEwjUpLbay7bbAhUR448KHeU8DUkQFjAAegQICRAB&usg=AOvVaw1N9BzFtyUCP4JU-2UQHQ0H.

I think, it is difficult, because the students with the rank below 5000 are eligible to get admission into these colleges.