There is nothing wrong with 2-to-1 training (when done properly!) but it sounds like you aren’t being treated fairly whatsoever.
Last week I heard of a school completing the off-road 3A reversing/coupling training for cat CE on a 5-to-1 ratio: 5 trainees, trained by 1 instructor, using 1 vehicle. I’m not saying its impossible, but I wonder how many of those trainees queried the duration and ratio before handing over their hard earned, and subsequently saw it as good value for money?