I studied with Martin in an advanced level class with the goal of obtaining my CBC. He is very familiar with the model of the exam the Government uses, so we practiced a lot of simulation over questions and topics of interest. By getting immediate feedback, and working on issues like ‘fossilizations’ (errors you make over and over again) I got noticeably better in little time, and had a good idea of how to answer many work related questions in a C way more naturally. Also he has access to A LOT of really good material that is actually interesting. He tries hard to keep study time fun and casual, so joining class was a pleasure! Absolutely recommend! Good luck!