Hey aspirant!

Whether a classroom contains both boys and girls or only either of them depends on the type of institution. A Co-education institute comprises of boys and girls studying in the same classroom whereas an "all boys" or an "all girls" institute comprises of only boys and girls respectively. So, in order to answer your query, tell me the name of institution in the comments or rewrite the question with name of institution which you are referring to in the query so that I can answer your query accurately. You can yourself get this knowledge by either visiting the institutions' website, admission brochure or contacting the institution through any means.

Hope this helps.