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There is another rank which is given, apart from CRL, called as JEE Advanced Preparatory Rank. For example, if your JEE Advanced Preparatory Rank is 150, then it will be written as 150-P. It is completely different from CRL and it has a different meaning also. Let's know more about it. The vacant seats reserved for SC, ST and PwD candidates will be allotted to the candidates of respective categories for admission to a preparatory course of one-year duration on the basis of relaxed admission criteria. Admission is given to the candidates in the preparatory course provided
The seats reserved for the respective category are vacant and Candidates have not accepted a seat in the preparatory course earlier.

If you want to get into research programme M.Sc, then I think a rank of up to 200 will be fine, but there will be a detailed technical interview. For the course programme (ME), a rank of 30 may or may not get you a seat. A rank of under 10 definitely will, this is generally applicable for all the different streams of GATE through which the Aerospace programme at IISc admits students. The course programme is fairly intensive with 15 courses and A.M.E. Project. My friends used to stay very busy with so much coursework. The research programme has 1 to 1.5 years of research involved and 1-2 publications are expected, course requirement is minimal and only 4 courses are required. The M.Sc. Programme is designed to help the faculty to have students do their research, so it is entirely in their hands to let you graduate, just like in a Ph.D. The M.Sc. could take at least 2.5 years in most cases. Placements vary greatly from year to year. Companies that visit are Airbus, GE, Rolls Royce, Eaton, GKN aerospace, Timetooth etc. It might happen that a student with a good GPA also might have to apply off campus. Some companies don't have openings for M.Sc. Students.

As I myself got 185 marks in JEE Main and cracked JEE Advanced with a rank of 20k and went through JoSAA in 2017, I think I am the right person to answer this. First of all, I would like to say you that you cannot predict about the marks very accurately so rank should be the parameter. Coming to NITs, there are 3 tiers of them. Not all NITs are the same. If you want to get CSE in any of the tier 1 NIT, then your rank should be less than 2000 in JEE Main. If you want CSE in any of the tier 2 NITs, then your rank should not exceed 5000 in JEE Main. And if you just want an NIT tag (which you shouldn't as NIT tag is not any big tag), then for CSE your rank should be less than 10,000.