The other practical side is this:
A boy whose parents I know hasn’t got into medical school this year. I don’t know his grades but do know he had a remark because he was 2 marks off the grade he needed but it didn’t go up. I bet he wishes he had done 3 rather than 4. I bet his parents aren’t too happy with the school either. There are threads on the Oxbridge and other threads in the last few weeks on a similar theme (different subjects) where they have done 4 but not got an A or A* needed in their 3 grade offer.
I think schools are doing a real disservice to pupils in these cases, with Further Maths an exception. When it is imperative you need the A’s and A* and you are competing against most people doing 3 it’s madness. My Dd’s exam timetable was bad enough only doing 3. She did humanities (bunched together) but sciences/maths seemed to be bunched together too. Her friend (doing 4) had 3 exams scheduled for the same morning so she was in isolation for 24hours so she could do 2 one day and one the next morning. This friend dropped a grade too.
Think of the practicalities, the lesser stress levels and the time created for voluntary work experience in doing 3.
Education is about acquiring knowledge and to this end 4 is commendable but actually if the target is to get into medical school requiring 3 high grades, aim for the 3 high grades.
I think more schools will stop doing 4 to be honest for all the reasons above. I know a private school nearby who used to do 4 but now does 3 (except further maths). The points ‘toting-up’ system really isn’t used for the RG universities, if it ever was, so that rules out advantages of doing 4 ‘jack of all trades’.
ProfessorLayton1 and khaleesi71 are definitely much more relevant posts to consider than my anecdotal evidence of this year. However it is worth considering the actual exam period practicalities of doing more exams than the others (you are competing against) as well.