For SS, try to seek help from your SS teacher or friends who are
good in SS.
Then ask them to guide you on those which you have missed
out.
For English now, there's two part to it. Comprehension and
Composition.
Try writing one composition per week and ask your English teacher
to mark it. Then have a debrief session with her, ask her to show
you where you've committed your mistakes. If possible, ask her to
suggest how can you improve in the future. Whether it require
improvement in the content, grammar, vocab or other parts.
For Comprehension, these 2 parts. The comprehension and summery.
Buy comprehension assessment book and do. Always read the passage
twice before attempting the questions. As what the word
'comprehension' means,
it's testing your ability to comprehend. You must understand what
the passage is saying about before you can try the question.
While for the summery part, it's also a skill that you must learn.
There is a way of writing summery. Always find the
keypoints(usually 15 point), these 15 points will give you the
content marks. The rest are vocab and grammar.
My teacher told me that once you've identify the 15 key points,
then re-write these point 'In
your own word'. Here it's where your vocab is tested.