NIT

You have not written about the home state you belong. However, your expected JEE Main AIR is below 31825. The last year closing rank in the asked branch was 26535 at NIT Nagaland. Hence your chances are moderate for CSE in NITs. However, you can get the following branches.
1. Civil Engineering at NIT Sikkim, Meghalaya, Manipur, Patna, Mizoram, Durgapur, Arunachal Pradesh, Srinagar, Puducherry, Nagaland, Silchar
2. EEE at NIT Meghalaya, Manipur, Mizoram, Nagaland
3. Electrical engineering at NIT Manipur, Arunachal Pradesh, Srinagar.

Your expected JEE Main AIR is below 21217 because you have not mentioned the category and home state you belong. So, on the basis of another state quota you can get the following NITs in the general category for neutral gender as under.
1. NIT Sikkim
2. NIT Manipur
3. NIT Mizoram
4. NIT Arunachal Pradesh
5. NIT Srinagar
6. NIT Puducherry
7. NIT Nagaland
8. NIT Silchar.

Keeping the past years of trends in consideration, the NITs are difficult in asked course.

The M.Tech admission process of IIITs and NITs are same. At present, NITs, IIEST, NIFFT, SLIET and PEC take part in the Centralized Counselling Process to fill M.Tech seats in their institutes. All NITs fill their M.Tech seats through Centralized Counselling for M.Tech (CCMT). The registration process for CCMT begins in the month of April every year. The M.Tech admission process for NITs begins with the online application process through the official website of CCMT.

Hi,
Tuition fees of NIT previously was 62,500 per annum, it may vary now. It depends on which location of college/ institute you are getting also as per the category of the student. All the best.

Surely not, because 88 percentile is not much good for NIT Trichy and also 75 % and above is required in class 12th.

Your expected JEE Main AIR is below 58345. Top NITs are not possible at this percentile, however you can get NITs located in North Eastern part like NIT Sikking, Agartala, Meghalaya, Manipur etc. Please improve your JEE Main percentile up to 97 for getting admission in top NITs. The admission in IITs are based on ranks secured in JEE Advanced. Hence you have to apply and participate in JEE Advanced (Conducted among the JEE Main qualifiers).

Try Shiksha's College predictor for the same.