Hello,

I hope you are doing fine, Preparatory Course Rank in JEE Advance examination means that the vacant seats reserved for SC, ST, and PwD candidates , which don't get filled in the counseling, will be allotted to the respective candidate's categories for admission to a preparatory course.

Preparatory courses mean that for one year you will be prepared and trained in IIT , and then after one year you'll be declared pass or fail according to which you will get a direct admission in an undergraduate course from next academic session

I hope you find this information helpful. I wish you all the best for your future.

Good Luck