Salam
Well books aren't a problem to take along. The invigilators are aware that the aspirants bring their books along with them and many of the students obviously have a 2nd paper. They usually collect the books and pile them up in a corner in the hall, at least that was what the arranged last year. Bring as many stationary items as you like, even though I've seen students bring a single pen. It totally depends on you BUT DONT FORGET YOUR NIC OR ROLL NUMBER
Wish every one appearing this year the best of luck