matrix isn't that terrible, they walk you through all the different kinds of questions you could get for each topic and really break it down. the lessons are really well structured but can be a little slow.
where it does fall short in comparison to other tutoring centres though is that you don't get that much exposure to questions that are more complex, and in quizzes especially i found that all the questions were really basic and stuff you'd find in the first few questions of an actual exam.
the most difficult questions and the ones worth doing were in the workbook (but these weren't necessarily exam style, just harder, kind of like cambridge development/foundation questions)
classes start with a 15 minute quiz, and after around an hour and a half you get a 15 minute break. then for another hour or so you keep going through that weeks chapter.
overall, it's good and it definitely helped me be more comfortable and confident with mx1 content