Engineering Entrance Exam

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The weightage of JEE Advanced is not fixed. It can be of any marks. Almost every year the weightage is different.

Your state or city/ town in which you are looking fro admission matters. Your Category also matters in getting a college. You can get CSE branch. Do your research about the colleges in your city/town. See there last year's cut-offs.
Good luck.

If you are sure that you can do better next year or you can get some good college or a better rank in JEE, then you have to wait for it, otherwise don't waste your time and money.

Sorry to say but it is difficult to get admission in NITs for you.
Chances are very less. Apply for JOSSA and perhaps, you can get an admission by luck.

If you don't have a good rank in JEE, you have to try for some other CET entrance like MHCET, but the time is over as you have to wait for next year or try some another colleges through any other options like management quota.

The syllabus for engineering entrance exam is taken from 11th and 12th physics, chemistry and mathematics.

Yes, you can get a private college by counselling.

The All India Rank should be under 25000.