Hello aspirant,

Hope you are doing absolutely great.

So with regard to your query, JEE Mains exam is conducted by the National Testing Agency, and for the purpose of giving the exam, there are certain eligibility criteria for the purpose of this,

Initially, the eligibility was to complete the 12th standard with minimum of 75% of the marks, however this was changed by the officials and had mentioned, that those students who had qualified and are going to appear for the 12th standard exams are also eligible for the exam.

Further the intermediate marks are not considered for the purpose of getting seat in NITs, but you need to score more in the JEE Mains exam, so that scoring between 89 to 99 percentile will definitely land you in a best NIT.

Checkout the following link for any information regarding the eligibility criteria of JEE Mains: https://engineering.careers360.com/articles/jee-main-eligibility-criteria

Hope this helps you!!