In RJS, do I get any credit for an attempt at a jump or spin even if its not done to the required standard (eg, sit spin too high, jump not landed)
It's difficult to say either way as it's more about the whole package. My first competition was against a girl who was attempting a layback. I was attempting a sit spin and had an iffy flip jump (which worked that day). My coach made me watch her skate because as she said while the girl was skating it would be interesting to see how the judges ranked us. I was green with envy as I could see she was attempting harder elements than me, but as my coach was pained to tell me, I actually skated my program nicer. There was more power and flow. In the end I was 3rd and this other girl was 4th. The lesson my coach was teaching me was that quality can beat attempted difficulty.
Not sure if that really answers your question, but it's tricky to tell from the marks what exactly is getting credit and what isn't under RJS (6.0).
However if you're allowed two spins and they have to be different positions, I think it's better to use both spins and have one as the iffy sit spin, than to only have the basic upright if you're competing. And if you see the program and the competition as a way of testing out new elements then having an iffy new jump in the program helps you learn to get that jumper higher and faster (and landed).