Hi Amit,
It is okay if you do not want to opt for the college you were allotted in 2nd round of csab counselling.
See, if there is an option mentioned regarding the refund of the fees then you can go with that. Also, you can check official letters by the administration regarding the procedure and the no. Of round in which you can get the refund. Usually during the refunding process a little percentage of money is deducted after every round you participate in.
Hope this information helps you.
Thank you and good luck:)
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