The eligibility criteria for the college you have mentioned is that you should have atleast 50% in your 10+2 with PCB/PCM combination depending on your course. Thus you don't have to worry about it, if you have good ranks in the entrances and if you get >50% then you will get admission depending on your rank in the colleges you mentioned.

To know more about VIT visit the link below:

https://www.careers360.com/university/vellore-institute-of-technology-vellore

To know more about MIT visit the link below:

https://www.careers360.com/colleges/manipal-institute-of-technology-manipal

I hope this answer helps. All the very best for your future endeavors!