This is not meant for you if you have not given 12th board examinations yet. It is meant for the droppers( students who take an extra year after 12th to prepare for IITJEE).
In order to pass 12th, you have to get the minmum qualifying marks in each of your objects. If you do not get these minum marks, you need to sit for retest. This is what they are asking for, whether you are eligible for improveent or not?