Seems sensible - that is what I did and it worked out OK. Remember not to rush your studies - if you go into the brush up having covered it all, you will be able to spend your time 'hardwiring' the information and doing the feedback questions, rather that trying to learn new things like some people do.
Don't forget too that you may need time off for flying (and don't forget time for a REAL holiday - I have used all my spare time for studying and flying over the last 12 months and I'm shattered!).
Some kind of unpaid leave from work might be the answer??
Good luck....