Financial talk

ok, i started to learn to ride last year. i JUST passed the cbt (had never riden before) last year then left ridiong a motorbike until late last year, i had a couple of lessons and was quite nervous doing u turns and right turns and slow speed control, even stopping...i went on to ride a 500cc in lessons, wasn't doing too bad..now this year I started riding lessons again a few weeks back in preperation for my test BUT i am still a nervous rider, I have NOT completed a succesfull U turn yet and they have booked me in for a test at the end of june!! I feel that i am not ready for this as i only have another 3 lessons to do before that ( due to going on hol and work commitments) BUT my cbt runs out a day after the test....AM I WAISTING MY TIME DOING THE TEST IF I FEEL THAT I WILL NOT PASS? The training school know that i have a few probs to sort out but they are confident that i will do it.....i'm not so usre, i don't want to spend the money if i will fail.do i wait til i do anotha cbt? by the way i had to go down to a 125cc from the 500 as it was better for me. so i would be doing the test on a 125cc which i don't mind, but proves that i am a nervous rider...