Hi Reddy!

You can get in to Sastra by 2nd basis. The Sastra college prepares merit on 2 basis - 

1st basis - They take 70% candidates through this basis. The process involves 25% weightage to JEE mains and 75% weightage to class 12 score after normalisation. 

2nd basis - For 30% seats, candidates are selected on class 12 board score. You have to be 95% or 95%+ to secure a seat by this basis.

So you have an opportunity! You check for a seat in reputed college by your rank in counselling round here - https://engineering.careers360.com/jee-main-college-predictor