NIT

The counselling session of JoSAA 2017 will start on June 15, 2017. It is to be noted that all of the candidates will have to meet the required eligibility criteria. If the candidate does not satisfy the JoSAA Eligibility Criteria 2017, then he/she will not be allowed to participate in the admission process. The steps of JoSAA Counselling 2017 are given below:
Step 1: Registration and Choice Filling
To participate in the counselling of JoSAA 2017, the candidates will have to register themselves. The registration process will start on June 15, 2017.
Step 2 Choice Filling
After logging into their accounts, the candidates will have to select their preferred colleges and courses from the list which will be available as per their merit.
Step 3 Seat Allotment and Announcement of Rank List
JoSAA Seat Allotment 2017 will be held in online mode. The candidates will be allotted seats as per the merit and selection of college and course. The authorities of JoSAA 2017 will release the rank list category wise.
Step 4 Allotment Letter and Seat Acceptance Fee
All of the candidates who are successfully allotted through JoSAA Counselling 2017 will have to download their Provisional Seat Allotment Letter and e-challan for remittance of seat acceptance fee. Candidates belonging to SC/ ST/ GEN-PwD/ OBC-NCL-PwD/ SC-PwD or ST-PwD will have to pay Rs. 20,000 as seat acceptance fee. Other candidates will have to pay Rs. 45,000. The payment has to be done using the e-Challan or SBI Net Banking.
Step 5 Reporting Centres
The allotted candidates will have to report at the designated centres for document verification. It is essential that all candidates qualify the verification process.

Mahesh,
First, check this out what you have scored in class 12 as from this year The Ministry of Human Resource Development, Government of India has notified following two changes in the JEE pattern for 2017:
1. There shall be no weightage for the 12th class marks in calculating the ranks in the JEE (Main) examination,
2. For the candidates to qualify for the admission in the IITs/NITs/IIITs and such other CFTIs whose admissions are based on the JEE (Advanced)/JEE(Main) ranks, they should have secured at least 75% marks in the 12th class examination, or be in the top 20 percentile in the 12th class examination conducted by the respective Boards. For SC/ST students the qualifying marks would be 65% in the 12th class examination.
Another is what is the surety that next year you will get NIT only. What if you score less than this in JEE. Better would be to take admission in the college that comes your way.
In case you don't get a good college on the basis of these marks, don't go for some mediocre college. Opt for some of the good private universities like Lovely, Sharda, Chitkara etc offering various specializations in B.Tech.
All these universities offer world class learning atmosphere to students along with good placements. Some even offer good scholarships.
Good luck.