Hey varun! 

The thing is you need to study well to get into Anna University or any other good colleges. There are no short cuts of you do not study well period

You need to remove the pessimistic thoughts from your brain and work/study hard with determination and dedication to acheive you goals.

As for the cutoff for Anna University is here as follows - 

Anna University will release the cutoff through tnea 2019. Here are the tnea cutoff for the previous years which you can refer to - 

https://engineering.careers360.com/articles/tnea-cutoff

Wish you all the best!