It looks like SolidProfessor is giving accounts to teams again this year. However, you get 1 account per team, so I'd suggest having a mentor create an account to share with the rest of your team members (that's what we do). They have a bunch of great video tutorials on SolidWorks and Inventor (as well as other software). The lessons don't take terribly long. You could go through a whole series over the course of a few hours (which you might have over the holiday).
https://solidprofessor.typeform.com/to/ALnijp