Buy the thick chinese compo books, categorize them into themes
e.g. family, technology, environment etc. Highlight the useful
phrases and memorize them!!!
Ask your chinese teachers for notes and consult them when u hv
any qns. When they see that ur putting in effort they will
definately go the extra mile to help you. This applies for all
subjects.
Also buy and do your tys over and over cuz u know what kinds of
qns will b asked n how to ans them to get the marks.
As fr reading n writing maybe u can consider borrowing pri sch
chinese textbooks to practice. My friend did that diligently and
his chinese improved by leaps and bounds. When it comes to language
consistency is the key so try n integrate chinese into ur life
whenever possible!
Oh towards my chi Os my lao shi conducted daily oral practices
before assembly so maybe u can go w a grp of friends to meet up w
yr teacher. That helped alot as well.
Hope this helps n all da best fr yr Os!!!