Hello,
Yes you have to add both first and second marks to be eligible for BISAT if you have passed 12th. To be eligible for BITSAT the qualifying marks are you should pass 10+2 from a recognized institute with Physics, Chemistry, and Mathematics as Mandatory subjects. Adequate proficiency in English is also mandatory. If you are appearing for 12th in 2020, then also you're eligible. And, the minimum marks in the qualifying examn is you must have scored minimum of 75% marks in an aggregate in Physics, Chemistry and Mathematics. (PCM) to add on, you should also have scored minimum 60% in each paper.
If you have any further doubts regarding this, feel free to ask here in comment section.
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