groundschool is anything you do on ground AND is chargeable.
They do and will charge you for reviewing and some also charge for pre and post flight briefing.
I also went to Raibow Air once, but I was staying in Torrance, and it was a short trip. Extremely inconvenient for me. The people there to me (personal opinion) are ok......but I have heard great things about them.
Do carry extra cash, as some places will get you an arm and a leg.