Depending on the choice of institution you will have a safe score. You don't mentioned such preferences so I am giving you a general perspective. If you can score at least 300 marks out of 400 then you will have a good probability to get in NIT Trichy based on Home quota seats.

So if you are looking for Trichy this can be a safe score for you. For other colleges you should follow up the previous year cutoffs so that you can get an idea or ask at career360.com (//career360.com) :

https://engineering.careers360.com/articles/jee-main-cutoff-for-b-arch-b-planning

You can visit the link below for guidance in the preparation of JEE 2021:

https://engineering.careers360.com/articles/jee-main-preparation-tips

I hope my answer helps. All the very best for your future endeavors!