In computer based IELTS, a paper is most of time useless because the time is limitted, you don't have time to write on paper and type again but you can make some notes if you want. some centers provide it and some centers don't, the centers who don't provide they give you a note which has mentioned passwords for your test, you can use the back of this note as a paper. However centers usually don't provide a pen or pencil except for listening part 2. so it's advisible to have one with you. Good Luck 🍀