hi,

see for admission in manipal institute of technology you need to appear in manipal entrance test for ug courses. the basic eligibility criteria is candidates need to Pass  10+2 or equivalent course with Physics, Mathematics and English as compulsory subjects along with Chemistry or Biotechnology  or Biology or subjects related with  Chemical / Civil / Computer / Electrical / Mechanical streams from a recognized education board with 50% aggregate marks in physics mathematics and any of the optional subjects taken together. since there is no mention of particular year of passing of 12th exam, you can definitely apply.

https://manipal.edu/content/dam/manipal/mu/documents/Admissions/adm2020/2020%20Under%20Graduate%20(UG)%20Programs%20Eligibility%20&%20Admission%20Process.pdf