is Lincoln academy online high school real or a scam?

thelincolnhighschool.com is the website. i found out about a couple months ago and i tried to do a little research on it. i didnt have enough credits to graduate and lincoln high scool seemed to be a good choice because i could actually enroll and get my high school dimploma fast.. so it says. so today i enrolled. i payed the 49 dollars to enroll and right now it just seems a little weird to me.. because i dont see how you can get your high school diploma by taking a test of 100 questions. and they are easy middle school questions. so now im kinda skeptical about it. is it a scam? are there any people that have had success with it? i really want to know before i spend more money on it.