engineering service exam conventional paper attempt

can someone tell about the answersheet provided by the upsc for conventional engineering services exam ?

how many pages are there ? is it like the same used at our colleges 40 pages standard size ???

can someone take the extra answer sheet if he need that ?

can someone use colored pen for writing as well as drawing figures or only blue black pen is allowed for writing and pencil for drawing figures ?

how to attempt engineering service exam conventional paper in a better way ?