Hello Abir , no need to join coaching classes. But a condition is for this. You have to give separate time for self study. Dont study only 11 & 12 th books. Make use of other books also which are specially for VITEEE exam. Make use of videos to clear concepts. 

No need to join coaching , because even if you attend classes then also your self study give you result.

I hope it will help.

Thanks.

hello abir

it depends on the level of your preparation. if you are performing well in school academics then you can crack it by self study by devoting certain amount of time daily but if you are not confident about your preparation then you can join a coaching for it. you can prepare as per the tips mentioned at https://engineering.careers360.com/articles/how-prepare-for-viteee-2019