Yeah. Each sub question from a new page like @Mayank_Chowdhary said.
Kal English hai Kya? Don't worry it's really easy guys! All the best! Just remember don't lag behind. There is a lot to write, so remember to finish everything in time.
My actual maths answer sheet from the boards.
I had it photocopied when I submitted for reevaluating.
have a look
Notice the margins on the sides.