I found out after I'd already passed the aptitude tests that there is a near identical copy of one of the main pilot tests at the RAF Museum at Hendon. It is in the kids' section and involves keeping a hot air balloon in the centre of a screen by using rudder pedals and a joystick which moves in pitch and roll but only affects the balloon in pitch. A bit of practice on this, and it will almost certainly help. With not many slots this year or next, you're probably gonna need it. Even better, the museum is free and worth a visit anyway.
TeBoi
ps The real test does not involve a hot air balloon but the controls and principle are absolutely identical!