I registerd through the "get 7 days for free" link and I,ve been charged immediately with 1 year subscription fee. In exchange I didn't have access to any learning materials. I was aking for refund but they are not willing refund me. 100% scam. The payment site misleadingly mention that for the 7 days free access need to provide paypal account or bank details but I will not be charged. This is not true, they will charge immediately. It is written that I accept the term of use by clicking the "the get 12 month access"link. There is no link to the terms of use. Another undisputed sign of scam. If you don't want lose your money don't try to subscribe. Find any college or university which provide a proper course.