Including English, physics, chemistry, maths calculate your percentile. If this comes out to be 75% mention that in your application. This will make you eligible for taking admission in government engineering colleges like nits, gftis. 

Hi aspirant 

thanks for asking your query as you have secured 75 Percent in 12th therefore this makes you eligible for the csab counselling ,simply fill your 12th percentage in the box and it will accept it ,no need to worry about the top 20 percentile because you have fulfilled the minimum percent criteria.