Hey shubhankar! 

Bitsat eligiblity criteria 2019 - 

The following parameters make up the eligibility criteria of bitsat 2019 which the candidates have to fulfill.

Age - there is no age limit for bitsat 2019 exam.

Qualifying exam - candidates need to have passed  their class 10+2 from a recognized central or state board with physics chemistry and maths as core subjects.  

Minimum marks in qualifying exam - candidates should secure minimum 75% marks in aggregate physics, chemistry and maths.

Direct admission to board toppers - candidates who have obtained first ranks in their respective central or state boards in India 2019 will be given dueect admission to the program of their choice irrespective of their bitsat 2019 scores.

For more information you can check it here - 

https://engineering.careers360.com/articles/bitsat-eligibility-criteria

Wish you all the best.