What I see on the news and here about GCSEs and it sounds crazy!
-different exam boards 
-modular exams
-sitting exams in different years
-inflexible attitude to deferring entry
-no automatic entry to local school
-league tables
-some courses being 'worth' numerous GCSEs
-going to secondary at 10/11 rather than 11/12
-church schools
-academies
-different systems in different regions
-local authorities not having enough places for all their residents
-a high proportion of private schools, with eye watering fees
-schools making kids do 'Micky mouse subjects' to get them up the league tables
-a ' choice' system which favours pushy middle class parents
-too big a jump from GCSEs to a level
-too few a levels taken
-not knowing a level results before applying to uni
-Michael Gove being in charge!
I don't know how you all put up with it!