NIT

IITs and NITs do not offer degree course in BCA.

JEE exams are just tricky. Just clarify your concepts and then try. You will solve most of the previous year's questions and in JEE advance you need to use many concepts in same questions.
To get a good NIT you must secure 170+ marks out of 360 and total marks vary in JEE advance but to acquire a seat score should be 130+. If questions are very difficult then 100+ is sufficient to get a seat.

Yes, for that you have to qualify competitive exams like JEE Mains, BITSAT, VITEEE, KIIT, SRMJEE, etc.

NIT Trichy, Suratakal and Warangal are the best among NITs for civil engineering graduation degree.

Hi,
Following are some best engineering colleges:
DTU, Delhi
NSIT, Delhi
IIIT, Delhi
GGSIPU, Delhi
LPU
Chandigarh University

No, for NIT you have to qualify JEE Mains and for IIT, JEE advance.

It is difficult to predict. Go for JEE Mains counselling or use shiksha's college predictor for references.

Check the website of NIT, Jalandhar. You can know about the cutoff for OBC category on the same.

It would be safe to assume that 140 marks would mean a rank around 35k-40k. I am taking the upper bound to ensure the worst case scenario. If you want to aim for computer science and engineering branch only, then there is a very slim chance that you would be able to get into any NIT directly. You would have to opt for internal shuffling which comes with the obvious risk of getting stuck with a branch that you don't want. If you decide on another branch that you would like to pursue, then maybe you can get an NIT.

The following NITs are ranked better than CUSAT: Trichy, Warangal, Calicut, Rourkela, Motilal Nehru National Institute of Technology (MNNIT), Durgapur, Jamshedpur, Kurukshetra, Jalandhar, Patna, Silchar and Hamirpur. It is obvious that CUSAT is not better than these NITs but it is not a bad choice if one can't get admission into any NITs.