Book for math portion of eds and number of pages
 

Someone please tell me k eds k math portion k liye sb se best book konsi hai, kyun k mian shafiq ki book mein math portion boht hi km hai and second ye k 20 marks k question mein number of pages kitne hone chahiye, if we consider front and back side as one page, then according to that tell me the number of pages. Please reply.