Got failed twice - what to do

I got more than 50 lessons, with 2 different instructors. I got nobody to do private practice with. Failed driving exam twice because of the same reasons: i have trouble with merging to the motorway from the acceleration lane and i press the acceleration a bit too hard generally (and apparently they don’t like that, even when i need to speed when joining the motorway). Now second time, i had winter conditions and i did drive slower than usual - on a 70 road, i had like 50 speed. They wanted me even slower apparently. I don’t understand the other reasons, i position myself well and see other cars and stop in time etc but somehow they still mark it on the exam i lack that..

At this point, i feel like giving up and the schools are just eating my money, no longer providing information to correct my mistakes.

Anybody having the same experience? What would you recommend?