My DS has 2 entrance exams whitgift & reeds in 4 weeks , he has been working hard but his results on practice papers seems to still be erratic one day he gets 100% the next day its 60%. am planning to stop study over Xmas but will need to resume work w/c 30th as I'm at home for the next 10 days. Am planning to have an intensive 10 days before the exams can anyone advise the best way to tackle it , DS can't do long sessions works better doing short bursts for 30-45 mins is it better to do one day on one subject or mix it up ?