Hey,

In every Central Board of Secondary Education  school there are usually five subject in class 11th and 12th. As you are asking for PCM. It will comprise of physics, chemistry, maths, English and either phe or computer.

Some schools also teaches 6th subject  as an extra one that completely depends upon the school that which subject they want to teach to students as an extra one.

But basically they have five subjects in PCM.

Hope that helps.