When you take classes other than the first year curriculum and a few most common upper level (corporations, trusts, evidence), you're going to have to move away from commercial supplements in order to do well in the class. So, a course like Internet Law requires a little extra effort. Case reading, on Lexis or Westlaw, using Shepards or KeyCite; treatises; and law review articles are helpful. They are also better resources for actually learning the law.
What case book are you using for Corporations?