Hey again,
I would let your instructor know the difficulities first. Are you a solo student yet? I'm sorry, I have not read any of the postings on here.
Then I would maybe go to the practice area and work on your straight and level flight and while your out there, get some of your excercies in. Also you should know the power settings for each part of the circut. Once your at the power setting, TRIM! I also never fly with two hands. I use my left hand for the stick and then my right hand if free for the throttles etc... But remember practice makes perfect. Also, its difficult to keep altitude if there are a lot of thermals around, which this time of year where I live are non existant! I once encountered a thermal that shot me up 300'!!! If that happens and your in an exam, don't worry, they know the conditions of that day
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Relax up there! Enjoy what you are doing and it will soon come to you!