Hii
I don't think you can make any changes or you can't get any other colleges after this. Since all the three rounds are completed, you have been allotted seats,so you must report to the allotted college with their documents to complete their admission formalities & Physical reporting at colleges will start on July 20 to 23, 2018.
Still have any concern, kindly contact the officials & tell them your query.
All the best.
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