Thanks for all the help everyone. I didn't *think* that there was specific canon knowledge about the year, but I just wanted to make sure before I wrote it.
I knew First Year wouldn't work, as they don't make the team/are allowed brooms in their First Year, but Second Year seems to be a general consensus, so I think I'll go with him trying out and making the team in his Second Year.
Once again, thank you all for the help.
~Megan