The Theory of Knowledge essay is strange. It rewards a very specific kind of thinking that the rest of the IB does not. Students often come to me saying they wrote 1,600 words of good prose and got a C. The issue is usually not the prose. It is the structure of the argument.
1. Pick the prompt that has a natural counter-argument built into it
Every TOK prompt can be read two ways. The prompts where that second reading is obvious are the ones that write themselves. If you have to invent the counter-argument, you are already working harder than you need to.
2. Lead with a real-world situation, not a definition
Examiners have seen every possible opening definition of "knowledge" and "certainty". Start with a specific, vivid example. A scientific discovery that was later overturned. A historical account that different groups remember differently. The definitions come naturally after that.
3. Two Areas of Knowledge. Not three. Not one.
Three AOKs makes the essay shallow. One makes it narrow. Two lets you contrast properly.
4. Your counter-claim must be a real counter-claim
Not a weak one you knock over. A strong one you genuinely engage with. If your counter-argument sounds like something you half-heartedly wrote in the last 200 words, the examiner will see it.
5. Conclude with nuance, not resolution
TOK is not a debate you win. It is an exploration. A good conclusion says what you have found and where you still hold uncertainty. Do not force a neat answer.