All you can do is keep practicing questions in your Revision Kit and learn from the answers.
Appreciate that the answers to past exam questions (and questions in your revision kit) are always much longer than you are expected to produce in the exam itself.
Check some of the marking schemes for recent past exams (it is printed at the very end of the answers that are on the ACCA website) and see how many points each answer is wanting you to make.
For each point you make there is no need to write a lot – just one or two lines is usually enough.