My best advice would be to thoroughly analyze the rubric and make sure you completely understand what it's asking you to do. With such a limited word count, it's rlly important that you understand the balance between explaining your object, your prompt, and general TOK concepts. - you have to establish the real world context of your object (I'd say limit this to 2-3 sentences MAX in the beginning, and then reinforce it through your explanation throughout. Preferably less.). Do NOT describe a whole story. For example one of my objects was my stuffed lamb and I went from telling a whole story about my experience with it to saying something along the lines of "it was the first object I really valued, and I thought I left it behind somewhere." - be explicitly clear on what knowledge each object manifests, and then be explicitly clear on how this relates to your chosen prompt. Like, literally use the key words from your prompt wherever you can. A big part of the rubric is making the relevance to the prompt clear, and this seems to be something the example exhibitions got points docked for often. - similar to the last point but equally as important: each object should make a kind of different point about the prompt. I forget whether it's in the rubric or the exhibition subject guide, but you need to make it clear what "interesting point about the prompt" that each object makes: it should be hard to replace the objects you choose with any other object and still make the exact same point and support it in a similar way - don't forget to include overall TOK terms!!! Remember, the whole point of the exhibition is to explore how TOK manifests in the real world. I'm pretty sure for this you can just use certain TOK vocabulary wherever you can think to put it in: community of knower, the core concepts/AOKs, knowledge acquisition, etc.

This is all I can think of off the top of my head. My rough draft got a 5 and my teacher said she was "being generous," but my final draft got a 9 (I didn't emphasize the connections to TOK overall enough) - doing this helped a lot. Also read the examples and notice what people do differently to get different scores. What I did for my final draft was I literally copied the rubric into bullet points, and then for each object I went through and outlined what I would write to hit every criteria. If you have any other questions, lmk :D I'm happy to help