Discipline and resources are issues to look into. Do you look
through your past mistakes and make sure you do not repeat
conceptual mistakes? I suggest you let your teacher in school
review your common mistakes first.
So,from what i read,you are considering to take A levels next
year. Alright,I suggest after PW at the start of november,find a
tuition centre/private tutor to go through the syllabus concepts(J1
topics instead of J2 headstart) You will really need to build up
your foundation by next year,be it in private candidate or not.
Rest assured and follow your tutors,believe in them and
yourself,take time to clarify your doubts if you do not
understand.
Do develop a passion for the subjects and not blindly
study>>It will be easy for you to do well in that subject.
Perhaps,take time to find out which subject influences your future
ambition or uni course.Everything will fall in place on that
subject.
Why did I mentioned all the above?
A friend of mine,who studied hard,retained.You need to study
smart and analyse the concept behind the question.Take your time to
analyse instead of jumping to complete your revision. Read as many
times,practise as many times,ASK as many times till you finally
understand it. If you are doing this,you are on the right
track.