since u read so much and still cant write properly, i assume its
ur language problem, simply put, ur english not up to standard,
becoz its University of London, so they expect good english...
after ur exam buy newspaper and read everyday lor... last time i
secondary 4 my english was c5-6, den i started reading newspaper
regulary, my english improve alot lor, i dun wanna hao lian but its
true that if ur english is not vv good, u should read
newspapers
or u can try reading the question properly before answering? it
could also be that u too kan jiong, try to relax, bring jacket when
u go for exams, wish u good luck