I feel if I asked' Repeat Last' too many times
Using correct RT will impress them. It's "Say again" or variants of:
Say again
Say again all after
Say again all before
Say again QFE
Say again runway in use
etc. But, if you
need something said again, ask as many times as you must. If you haven't got it on the 5th transmission, ask again and again. You need that information and they know you need it. Don't feel guilty, nobody will think badly of you.
Keep the radio as simple as you can. Don't talk to anyone you don't have to and don't ask for services you don't need. All that extra radio just increases the workload. Save it for another day.
Don't get stressed, just enjoy it. I expect you're doing Goodwood - Lydd - Headcorn? It's easy, it's fun, you won't have any trouble finding any of them if you do the things your instructor has taught you to. Choose good food at Goodwood, sit outside in the sunshine and watch the aircraft, don't drink too much lemonade and remember to wee before you leave. Twice.
I hope you have fun.