instancert.com… you pay i think 20 dollars per month it automatically bills to your account till you discontinue it. i used it for college math this past summer and it helped me a lot! i think its also guarenteed so if (chas visholom lol) u dont pass u shud get your money back. it basically uses flashcards online with examples to make things clear. also whenever there was a topic that i wasnt clear on i googled it…there were some random sites out there that had lists of rules and stuff that helped me.
Good luck! Trust me: if i passed the clep, you can too 😀