VIT classes may start from 2nd of september (according to a YT channel). And josaa counselling would start from 12 september. How people manage things?

There is a YT channel: Lucky Jethani IITB. Telling that VIT classes would start from 2nd of september.

I have attempted VIT and pretty sure that I will get CSE or CSE with specializations in Vellore campus with Category 1 or 2. So I want to keep it as my backup till the last week of Josaa counselling.

So how would I manage? If I decide to go to VIT at the end, how will I manage my missed classes and other stuff that people do at starting?