it's very easy to understand.

This course was excellent. Although the assignments were very hands-on and useful, they proved to be a bit too demanding, leading to some students not finishing on time. This led to the evaluation taking ages, and thus I had to pay for a month extension. This is the reason I'm not giving it 5 stars, not the assignments themselves, which I liked, but that fact that I had to wait literally weeks for other people to grade my assignments, which costed me money. I'm also not very happy with the fact that courses 4, 5 and 6 don't still have an open session, so I'm basically blocked for more than 2 weeks and I can't continue my path. For that reason, I will cancel my subscription until these courses are open.