My next lesson is in 6 weeks' time, and I know what I need to practise - coordinating my two hands.
a) détaché scales - the LH needs to anticipate the RH, descending is harder than ascending.
b) legato scales for string pivoting (hardest from lower string to higher on the up-bow) - fatal if the LH anticipates!
I guess there's nothing better to practise, but I'm open to suggestions.
The best exercise for me lately for LH-RH coordination has been shifting legato and détaché. You can use it in a scale for instance. Example, start on a down bow, slur two notes on the upbow, detache down bow and slurs on the next two notes. (upbow) On the third upbow however, use a regular détache. Repeat. Play with the pattern of slurs. Made a little illustration to clearify (hopefully) what I'm trying to say here.
'Armed with theory, practice becomes meaningful. Through practice, theory becomes fulfilled.' - Egon von Neindorff.