Dear aspirant

Your theory plus practical both marks are taken together for a particular subject. As of total you got 49/100 in biology by adding both practical and theory marks. Like that you should also get chem and physic Mark's. Then total of all three subject physic + chemistry+ biology. Then if you have scored more than 50% marks by adding all these you are eligible for NEET and taking admission in medical college.

As you have mentioned you got 170/300,if it is by adding p+c+b marks then you are totally eligibile for NEET as you have more than 50% aggregate marks in pcb subject. Individual marks are not taken in account.

Hope I have cleared your doubt.

All the best