Bristol Groundschool is excellent.
Stay in work all the way through, is my advice. It is hard. So be prepared to have no life, no girlfriend, no social life etc. I frequently take my manuals to the local Starbucks or Coffee Shop. It helped me! Keep current on the flying, too. Helps maintain focus.
I've been working fulltime for the last three years. An hour or so in the evenings during the week. Half an hour during my work lunch breaks and about two hours on a Saturday and Sunday. Picking up the pace in the two months before brush up with an hour or two on the 'company time' doing the Question Bank and an extra hour or so at the weekend.
One piece of advice is to break General Navigation & Meteorology off from the first batch of exams and do them a month or so later. Most people find these the tricky ones. It's worked for me. 85% average so far. Going to do the same for Module 2 and break off the two most complicated ones.
P.S You'll have to use all of your annual leave more than likely.
