i think firstly, is to build your own model skills. it is very
essential in PSLE, then followed by the guess and check rule, which
i think most of us will have forgotten. then teach your cousin
serveral algebra skills, as simple as possible, and know where is
the limit of algebra. no complex eqn, and that would be fine.
Try and build on the problem solving skills as it takes up 45%of
the entire paper (or 55, i can't rmbr.)
My sis is taking her PSLE and i am taking my o's next yr, so
it's like impossible to teach her... haha.. worst still, she FAILED
BADLY for her maths, mcq, 15, section b 20+ if i am not mistaken,
then section C, problem sum, 8/45 =.=
if u want, i can hand my sis 2 u ^^