Mr. Chaves is an extremely gifted chemistry teacher. It’s such a difficult subject–my son was drowning by the time we found PLZ. This was truly a last ditch effort on our part. Mr. Chaves was able to turn that ship around after only 4 lessons and my son passed the SOL! He was able to distill difficult concepts in a way that made them comprehensible and he was patient and kind and gave my son the confidence to succeed. His actual eacher expressed surprise and made a point of telling him he didn’t know how he did it but he was impressed. It takes a gifted teacher to get results like that.I only wish we’d found PLZ and Mr. Chaves in the beginning of the school year.