No if you have Successfully qualified your 12 th exam then there should not be any problem in your admission. If you appeared for Class 12 in 2016 but failed in the subject and are appearing in 2017, you are not eligible. However, if you appeared in 2017 and have failed in one subject, you have cleared it in 2018, you are eligible. If you have failed in 2018 and are appearing in 2019, you are eligible to appear forJEE Main 2019.