We are all different and learn at different paces, when allowed to do so!
The nice thing is that you are not in a race, or have to worry about homework, grades, and the like. You have to decide what works for you. Personally, having completed both courses separately, I can look back and see an interesting possibility of using alternate days to study those two courses. Part of the solution depends upon you. Is it best to complete one course and then start the other?
It seems like studying each course on alternate days will allow you to "clear your mind", and concentrate on what you are doing. At the same time, completing one course at a time will allow you to focus on specific elements and requirements of each course.
Keep a log of your progress, and let us know how things are going.
Tom