Every year cbse conduct improvement exam for those who is not satisfied with their performance.
Many students wants to improve their percentage because jee mains/advance required minimum 75%.
In this year many jee mains/advance aspirants fails to get their desire college in spite of getting good ranks in jee mains, they are not eligible for nit/iiit/iit and other government funded institution because of 75% criteria.
Private/Improvement Examination for year 2019 Online link is expected to be live from 3rd week of October 2018 according to cbse official website.
Procedure and terms and condition will be updated soon.
Update :- Cbse finally get a form for improvement . You can check this website http://cbseonline.ernet.in/pvtform/
Better to read all the terms and condition before you apply . ALL THE BEST STUDENTS!!!