Out of practice

My attempts to go without Lego while my exams were on failed, however they lasted long enough for my abilities with power functions to diminish somewhat.  Where once I could build a fastish, solid, good looking car, there is now a slow, slightly wobbly car with no bodywork at all.  And unfortunately I can't rectify this, because I still have exams and only have a little bit of time to devote to these things...