Hello aspirant. Since you didn't mention any particular state, I would consider it as all India quota. Only 10 percent seat are there for all India  quota. So the eligibility critetia is that, you would suppose to get 45 percent Mark's in math, physics and chemistry. Individually 45 percent of subject mark should be attained. Since you have got 171, you have a fair chance in getting admission over there. Look out for applications and give your best.

All the best

Regars

Nikhitha