According to Jee main eligibility criteria, only those candidates who have passed their Class 12th Examination or any equivalent qualifying examination in 2017, 2018 or those who are appearing in their Class 12th Examination or any equivalent qualifying examination in 2019 are eligible to appear in JEE (Main) Examination be held in April 2019.Thus if you have passed the plustwo level exam, you can appear for jee mains.But admission in NIT require minimum 75 percent marks.