I took Health Safety and passed the exam. One thing I noticed while studying and comparing information from SG101 was that SG101 had a LOT of wrong answers in the practice exams. I highlighted a lot of differences between the textbooks and the SG101 information, and I'm sorry but some of the SG101 stuff was just plain wrong. I'm not sure how they are for Chronicity, but I think what helped me pass was using the materials from the recommended books (a lot of the questions were straight out of The Point online as well as the textbook study guides), and taking the EC practice exams. I honestly wouldn't use SG101 solely. Just my opinion. Everyone has different study habits. Good luck!