Semi-seriously; I could ride to school without touching the handlebars at all (except to brake, but look/plan ahead so you minimise braking). Balancing your school chair on
one leg will help balance, and pass the time in RE or German. Turn off the computer and go play sport. Do 5 relevant calculations a day in your head - time for the car/bus/bike/me to reach destination, then ETA; that kind of thing. Don't just do sums on paper sat at your desk. When you get good,do the sums whilst riding the bike with no hands. You might not want to do this on a public road to start with
The practice tests are quite representative (I last visited OASC in 2007).
Be aware that there is not much you can do to improve fundamental motor skills past a little bit of practice - you've either got it or you haven't, so just relax and give your best.
Try this for multitasking:
http://www.kongregate.com/games/icylime/multitask
http://www.scientificamerican.com/ar...asking-skills/