We have limited the amount of subjects to 7 per student.
Firstly, that gives you more than enough room for choice for the amount of subjects or units you need to complete your course (or to meet your Uni requirements). If you are looking to do more than that, it’s probably not a great idea!
Secondly, we want all the videos and resources to be tailored to each individual student. Limiting the number of subjects means students are less likely to share their membership with friends and means we keep control of our site.