Humanities - practice the formats, memorise the information.
regurgitate.
Physics and Chemistry - right now, memorise the concepts and
practice.
Emath - this subject is very easy to score. to
excel in it, you should practice on geometry - "Angles, triangles
and polygons", "Mensuration", etc - finding angles, length,
etc.
English - paper 1: memorise situational writing formats
and read the 'good' letters/speeches selected by your
teachers. For the format, it's best to know every format - rather
than find a 'pattern' and predict which format will come out -
because the format last year may come out again this
year. Whereas for the essay, choose the easiest question
to do. paper 2: well, I did the comprehension questions
first. (sorry, I cannot remember how I did it.) (well, I
took my O levels in 2012. The syllabus
for English is different now. Not sure if this
is still relevant.)
Chinese - paper 1: read 'good' works (email and
essay) selected by your teachers. do the easy question for
essay. paper 2: (sorry, I cannot remember how I did it).
To be honest, I was not a good student. During my O level days,
I would simply mug and try to remember everything just before I go
to the exam room, and "pour everything out" in the paper.
Well, the ideal method is to practice. You should do all the TYS
papers and other school's prelim papers. Form/join study
groups. Consult your teachers.
If you find it difficult to form/join study groups and/or
consult your teachers, ask your Form Teacher(s) to help you
form/join study groups and/or contact teachers to help you. I am
sure he/she will help. Otherwise, ask your Level Head
(Co-ordinator) to help you.