Hello aspirant

You should not worry if your aggregate score in physics , chemistry and biology is 50% .

You have got 49 Marks in chemistry,  81 in physics and 60 in biology then your aggregate score in pcb will be 49+ 81+60 =  190 , it is more than 150 .

According to Neet eligibility criteria the candidate must have completed 17 years , student must be an Indian.  The candidate must have passed class xii with physics, chemistry and biology with minimum 50% marks . English is also compulsary subject.

If you fulfill above criteria you will be eligible for neet . After that on which college and which medical course will you get depends upon your neet score .

For getting admission to government college you need to score 610+ marks in Neet.

It also depends upon cut off neet, cut off altimately depends upon number of candidates appeared, difficulty level of exam, availability of seats , previous year's cut off etc .

So focus on your neet preparations rather than thinking about these things.