Also try to plot your exams so you don't end up having to wait to do your skills test due to not completing all the exams towards the end.
I tried to complete 1 exam every 3 - 5 weeks, if you fail one (many people including me failed air law first go) you will have time to re-study.
I have known a couple of people ready for their skills test but not completed all the exams.. Get them out of the way - you can then work on the fun bit - the flying