Ashish, this is the first time that VIT had to cancel its entrance examination and conduct admissions based on Board exams and JEE Mains. And it has also been announced that weightage will be given to JEE Mains score. While the marking and weightage scheme has not been announced yet, this answer is being written with general information. Once VIT releases any official information regarding the weightage and marking scheme, we would be able to answer your question with more relevant information. Now admissions to VIT all campuses will be conducted without reservation and all seats are considered Open Merit. And VIT Vellore has approximately 100 seats allotted for Chemical Engineering and 710 seats for Mechanical Engineering. With 88% in your 12th, it might be easier for you to get a seat in any of the branches. Though the admission process might be different this year, https://vit.ac.in/viteee-counselling#:~:text=Mechanical%20Engineering%20had%20the%20second,filled%20on%20the%20first%20day. should give you a glimpse of how seats are filled according to the branch.