SLR918

Hi guys, I am new here and wanted to get your opinion on using online tutoring websites for preparing for GMAT/GRE. I noticed that I get stuck on a particular type of problems (such as rate problems in math) and it works best if someone explains the problem solution individually to me rather than me just reading books on it. I used this website www.mechminds.ca recently and found it very helpful for math. Was wondering if anybody else has tried out anything similar which they want to share. Thanks for your help!