Hi Ben , this issue you have come across means that you understand the content and the questions which is great, but are not 100% in the application of your answers. This is a very general problem that most students may come across as they most definitely know the content and the answer, but struggle to show that understanding in your writing.
The Atar notes lectures are definitely a resource you can use as mentioned already.
As you come across questions which 'need more detail' or needs a 'stronger link' to the case study, a good starting point is to look at high scoring or upper-responses for these questions and ask yourself what is the difference between my answer and theirs? What sets the sampled answer from the rest and why? Usually some of these reasons are:
They use 'signpost' words such as 'one advantage, another disadvantage, in comparison, it involves..." Practicing using these same kinds of sentence starters for certain task words can help stabilise how you construct your responses and identify what is required. I know you have said you understand the tasks words, but is your approach to a certain task word the exact same as the previous ways you have answered it? Make sure that you are clearly and directly showing what you are talking about in your response! It seems you are doing this in the examples I see, well done!
*similar to signposts, using the specific name of the business or manager names is important too
I am not entirely sure what marks you have obtained (e.g 3 out of 4) from the images previously but usually the lines provided in the test papers can signify how much approximately you may write for the answer. Obviously, some people's handwriting is smaller or larger and in some cases that many lines for the question is actually not needed. But this point is good to keep in mind.
For questions where you must propose or justify the use of a strategy, theory or type of plan, you can always approach this by thinking about (1) - what it the benefit/advantage (of theory/strategy) for the business and why, and (2) - what is the outcome if there was a lack of or failure to use this kind of strategy (technically if they don't use strategy A/B)
Have you gone in depth and explained? Especially in study cases, you may have identified and briefly explained the theory applied to the business. But have you very clearly shown how it is applied to the business? Apologies if I am not explaining this well enough.
For example, the questions about customers having an effect of the change at the mentioned business. You have provided a clear identification that the range of products (beverages) has increased and therefore that is why it will support the business's change. But why? Make this clear to the examiner and go further another step such as "The increase of options will broaden the targeted consumers/customers and thus be able to expand the number of purchases, supporting the change at [name of business]. I hope this makes sense?
- Do you understand how many disadvantages/advantages/points explained will get you the full marks? There may be a 4 or 6 mark questions for things such as benefits or costs of something. This may mean (for a 4 marker) that you need two disadvantages and 2 advantages with brief explanations, OR 1 of both which have in-depth explanations. This is similar to a definition questions which is not just 1 mark, but 2. This means you may identify a certain characteristic in addition to simply just the definition.
These kinds of decisions can affect how you respond to questions. A very helpful strategy my teacher got us to do was create a checklist which showed how each mark would be awarded for different questions and mark values. I think this would be a great study task to do for you.
If there are any students in your class or other resources you can see high-scoring responses which required an in-depth written answer, ask them as well and if you can, get them to explain their thought process too! Good luck!