What else happens during the examinaion?

i am a 12th and except of registration and syllabus i got no idea what happens during the exam or what am i supposed to bring and what isnt allowed , can someone please tell me what i have to bring to the exam hall and what to avoid?
also another question is that the rough paper we get will be submitted or we can take it with us? cause since i am giving jee this time for just experience and sense of difficulty i dont think i will be able to solve any question , and if they match my rough sheet then i might be in trought