Hi Venu,

You can definitely opt to sit for any entrance examinations again and there are no restrictions in that regard as long as you fulfil the other eligibility requirements like age, class 12 marks etc. Infact many people do this to study at better institutions or shift to better courses. The only struggle would be to cope up your JEE/CET preparation with your first year studies but it is quite manageable. Study really well so you can get better ranks than this year. Learn time management by solving mock papers.

All the best!