Hi, would greatly appreciate some help with a serious timing issue I'm facing in the quant section!

I faced this issue during the actual exam that I took about two months ago, and am still facing it on mocks. Typically around the midway point, I find myself falling about 10 minutes behind schedule. Consequently, I become stressed, and despite my best efforts to stay calm, this stress often leads to small but critical errors such as miscalculations, misreading questions, etc which causes me to miss relatively easy questions.
In addition, I also often end up guessing the last ~6 questions.
Therefore, I believe that I desperately need a better time management strategy.
I've attempted to limit the time I spend on questions where I feel stuck, but this hasn't provided significant improvement. It's challenging to balance solving a question effectively with the time constraint for each individual question.
Does anyone have some solid tips or advice for my situation? I would be immensely grateful for any assistance!