We suggest you set aside a regular study time at your desk, and allocate the first part of your study to revising the learning elements of the courses - such as the collision rules. Then you would move on to your next study module, follow through the lectures on to some exercises on the subject, and lastly start work on any homework exercises and some revision.
The Yachtmaster online course is an advanced course on navigation and meteorology. Anyone undertaking this course without having completed theory to the Day Skipper course level is likely to find it somewhat testing. Practical experience is also of great benefit - of the order of approaching the 800 miles logged that is required for the Yachtmaster practical exam.
Splash courses can be started at any time, available 24/7.