Hey!
As a highschool coach I get this question a LOT!
And my answer is always - what do you want to learn?
It is my job as your coach to assess your ability in learning that skill. If you tell me you want to learn a kovacs, and you can hardly do giants, we may have some words. However, if you have a strong swing, and really clean giants, and you say a full turn over the bar - well.. that's possible!
It all depends on your coach, what they are comfortable teaching, and how well you learn - as well as what you have already.
Just bare in mind, "common" is relative. Ive been to meets where entire teams did uphills (or, as the previous poster called them - hiccups), and Ive been to meets where one person outshined everyone else and did jaegers or geingers. There are SO many options - it really depends on you.
If you would like a list of common highschool releases -
Hecht (or Takachev)
Geinger or deltchev
Pak Salto
Straddle Back (to hand as well)
Shoot (to hand)
Cut catch
Back uprise 1/1
Uphill
And that funky little fly away from the low bar to high bar with a 1/2 twist.. cant remember what it's called, but they were really popular around me for a while.
It all depends on what youre comfortable with, and what you are willing to do. Really, you need to talk to your coach about what your options are - and if you arent happy with their suggestion, express that without whining.. please? Coaches are people too - I know it's hard to imagine, but we are. Many of us are very approachable, and easy to get along with when it comes to the sport we love.
Good luck! Keep us updated on which you choose and your progress!
Take care,
Ryan