JEE Main

You have a quite less chance of getting an NIT.
You should reappear in JEE Main exam so that you can improve your score.

NTA score and percentile are the same thing.
Your approximate rank will between INR. 6000 to INR. 8000.

Your rank will be around INR. 8 k -10k, so from home state quota you will definitely get it, because last year rank in HS reach 11k and if you are from other state. Well, make a try, but chances are very less. And, one more thing it is MANIT, Bhopal not MNIT. MNIT is in Allahabad.

I think with 94 percentile, you will get a normal NIT. For a very good NIT, your percentile must be 97or above.

The final AIR will be declared after April 2019, considering the best score out of the two JEE Main attempts for all the applicants. Hence, based on current percentile we cannot predict whether you can get admission or not. Wait for the final AIR declaration.
Details:
https://www.shiksha.com/b-tech/articles/how-to-calculate-jee-main-rank-from-percentile-blogId-19953

Check out the predictor below for MHT CET and fill COEP in select preferred college's option:
https://www.shiksha.com/b-tech/resources/mhcet-college-predictor
For JEE:
The final AIR will be declared after April 2019 considering the best score out of the two JEE Main attempts for all the applicants, hence based on current percentile we cannot predict whether you will qualify or not. Wait for the final AIR declaration
Details:
https://www.shiksha.com/b-tech/articles/how-to-calculate-jee-main-rank-from-percentile-blogId-19953.

Yes, but try to maintain PCM subject equally. Those concept not understand then see online guidance. Mainly, you should try best books such as –O P. Tandon chemistry, H. C. Verma for physics, Arihant Objective Mathematics Volume 1&2, or Allen JEE module by www. JEE world. In.

If you want admission in NITs, then your rank should be less than 20,000 i.e 175 marks in JEE Main and 93% in CBSE boards.

For more information regarding your doubt kindly visit the following link:
https://www.shiksha.com/college/mes-college-of-engineering-malappuram-30817