The most detailed course I have found online

The course is very well structured. You see your progresses, have intermediate questions to see if you have absorbed what you have studied, and also has every section organised by topic so that you can easily access the resource you are looking for.
It certainly requires concentration and planning, but it's full of resources that will certainly help you score a better score.
My advice is to start as soon as possible and to follow the structure as much as you can. If you fell comfortable with a certain topic, then it makes to skip some section but be sure you are not missing details that can help you save a lot of time during the exam.