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Hello Ammar,
There are hundreds of good colleges which provide good education and placement in computer science and engineering. So, listing all of them won't be feasible. If you can mention a state or states you're interested in, I can mention some good colleges in those states.
Most of the universities demand at least 50% or above in your 12th standard/ PUC for admission into engineering colleges affiliated to those universities. However, I would advice you to have a percentage of over 75% to be eligible for all placement interviews as well as most of the good paying jobs demand a percentage of 75 and above.
Along with these, you need to score good in entrance examinations as well. However, I won't be able to suggest you any score for that as it is dependent on the level set and the level of competition.
I hope I have been able to answer your queries. If so, kindly upvote this answer. In case you have any further questions, feel free to revert.

Hello Abhirami,
While B.Tech in private engineering college is more expensive as compared to B.Sc or BCA, it provides you in-depth knowledge and if you're able to grasp it, you end up in a much better job than what B.Sc or BCA can provide. If you can have a percentage of over 70 without any backlogs and also focus on knowledge rather than mark sheet, you can end up in a much better job with a much better salary in a very good company compared to B.Sc or BCA. On the other hand, due to in-depth knowledge, some students find it a bit difficult to pursue B.Tech and go for B.Sc or BCA.
So, its up to you to decide about the level of hard work you can put, the fees you can afford and the outcome you want. This should help you to find out whether to go for B.Tech, B.Sc. or BCA
I hope I have been able to answer your queries. If so, kindly upvote this answer. In case, you have further questions, feel free to revert.