B.Tech

Amity University is a good university for doing B.Tech in computer science if you are unable to crack JEE and make it to some other top private universities such as BITS, VIT, BIT-Mesra, etc.

Dear,
There is no link of scholarship or no need to obtained any sponsor letter from anyone.
These 2 categories depend on percentage on PCM of class 12th. Like in computer science for a non-sponsor category, the minimum percentage is 70 percentage in PCM and for sponsor category is min 65%.
In sponsor

Hello Manish,
Yes, there are many colleges in India which accept 60% aggregate marks in PCM. You can get admission there. Some of those colleges include SRM, KIIT, MANIPAL, GLA, Satyabama, Avantika and many more.

I don't think you'll get any good college but you can wait for JOSAA and try your luck.

This is a very long list and will be difficult to type all of the. It is better if you can Google and look for the answer. If there is any specific question. Please feel free to ask. I will try to solve the query.

Eligibility Criteria for admission in BTech at Amity university is minimum 60% in PCM + English in 10+2 stage. Candidate must have appeared in CBSEJEE. Selection is based on CBSEJEE Score.

Dear Manikya,
After B.Tech civil, you can go for marketing, finance and operations. These are suitable to you. In India, IIMs, offer best course and specialisation to you. Prefer to write CAT exam, get a good score, and then get a seat with IIMs.
All the best.