You can try to get a bit ahead with the level 2 module - and if you're thinking "no, I don't have time for that!" then there's your answer - which will help with some of the overlap. The start of many level 1 modules tends to be very introductory, which you might not need to spend much time on if you're already used to studying - some of the work will be exercises based around working out much time you can set aside for study, and figuring out how the OU systems work.