Get the hacked Cats from ocfaq.com, then you can overclock with ATITool. The stock drivers are locked against changes to the freq settings on the card. Also, if "VPU recover" ever kicks in, even while running the hacked drivers, the card gets both reset back to stock timings, and locked-out again. You need to power-cycle and reboot to be able to OC again.
My FIC Radeon 9200 64MB AGP 8x doesn't OC worth squat. The memory is 4ns, which should be good for 2 x 250Mhz, but when I bump it even to 2 x 210Mhz, I get artifacts. I probably need to add some ramsinks and a fan to the card, and/or voltmod it. I'm not sure how to do that on a Radeon 9200 though, and I don't think I've seen any guides for it. I suspect that my problem is power moreso than heat, since I've also had a few minor issues with display-corruption on a warm or cold boot.
PS. Sorry to say, but your friend overpaid a bit for the card. I wouldn't pay more than $40-50 for a 9200. For $80, you could get a nice 128MB Ti4200 AGP 8x card with much faster memory, that would stomp it in games. Btw, WalMart also has the "built by ATI" Radeon 9200 cards on clearance for $50, I just saw a few more today in a different store.