Are books that tell how to raise your credit score 100 points in 30 days for real?

It depends on the information they contain. If they tell you to pay your bills on time and if possible in full. Not to exceed credit limits or have umpteen cards or use advanced cash, etc..then they are good. If on the other hand they suggest questionable practices such as using false SS#, bad very, very bad. And a Federal crime. The best way to build your score is being a savvy consumer, and paying up as agreed, consistently.