What are some good spanish conversation fillers?

Hi, I am going to be sitting my Spanish GCSE oral assessment in a few days and I was wondering if there is any good fillers that I can use to make it sound more like a conversation and less like me reading. What I mean is things such as "umm" and "err" that we use in english. I am hoping to get at least 10 good fillers so I would appreciate any help :)