Hello Aakash,
You may do so by going to the university website and then canceling the provisional letter available in your account on the admission website. Read below pdf Pg 3
http://ipu.ac.in/Pubinfo2019/Admission2019mian/adm2019notices/cnbed26071910p.pdf
Refer to the above link to know the exact procedure of refunding the fees.
http://www.ipu.ac.in/Pubinfo2019/Admission2019mian/adm2019notices/adm2019NoticeMain.htm
Please visit the above link for more information about IPU CET dates.
Hope this Helps
Regards
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