After the CAT 1 exam VIT opens the course withdrawal link . If you feel difficult in any subject or you can withdraw any course Wish using the link.

Withdrawing a subject it won't affect your CGPA any way. But the subject you withdraw it shows w grade .It means withdrawal of subject. If you do that the same subject in next semester then you have to pay for 6000 for each subject u withdrawed. Its like Re Registering a subject .