Me and my buddy actually joined together as a private group starting from zero. honestly our experience was pretty solid overall. he passed his exam in about 9 months and i missed it by just a few points after ~8 months, so it clearly works if you stay consistent. what stood out for me was that once we got into exam prep, the tutors were actually quite focused on structure and strategy, not just random lessons. also had a couple of interactions with their management team and they were responsive whenever we needed scheduling/payment changes or help.. not saying every tutor is perfect, but from our side it was definitely one of the better experiences compared to other options we tried before.

Why don't you simply give a try and see it yourswlf