Absolutely possible!
It may be really hard but it is far from impossible.

First, I practised by having a single race on every track of a tourney (to avoid replaying by already having strategies for every track), then hopped into a tournament, eventually passed the challange at first attempt!



Unfortunately due to 30 minutes recording time limit the part when I set everything up is cut but everything should be clear from the races themself.

Anyways, I did second attempt after changing the limit to 60 minutes (with racebox settings captured too, so nobody would doubt that I did the challange fair). Suprisingly, this one went considerably worse than the first one (still passing but much more scratches etc. when racing).

https://www.youtube.com/watch?v=VxbwgvffkRs

First vid should be active about 2 hours after posting (the main one), the second one (the one in a link) - about 5. Sorry but my lightspeed 1Mb upload connection really can't do much more :/.