Let me try to answer your question !
I am in CBSE 12 and going to appear for my boards.
I gave my CBSE 10 in year 2015 .
It would be really interesting to answer your question.
YOU ARE IN 10th board, nothing to worry about.
Checking is little bit strict in SCIENCE AND MATHS !! a little bit, not like they are gonna suck up all of your marks !
I scored 8.6CGPA see my result ~