I faced this with one of my children who could inevitably get the right answer but was incredibly slow in getting there. We identified two or three types of questions that she took the most time over and got to the point where she left those questions until the end and then went back to them if she had time (with the caveat that if she did run out of time then she had to guess, any answer being better than no answer). In my view it was better to have a stab at getting 47/50 right rather than getting bogged down early on and only attempting 40 questions in total.
As it was, she didn't finish any of her papers in the time allotted
, but she did pass and is doing very well, and has speeded up as the years have passed
My other child was incredibly speedy but incredibly inaccurate