"But You Did Fine at School"

The most common reason adults give for not seeking an assessment sooner is some version of: I did well at school, so it can’t be that.

It is the wrong test, and it has kept an enormous number of people undiagnosed into their thirties and forties.

What school actually measured

For a bright child, school is a fairly forgiving environment for both ADHD and autism. The day is structured by someone else. The expectations are explicit and repeated. Deadlines are short and externally enforced. Social rules, while brutal, are at least consistent.

Under those conditions, raw ability covers a lot. You can be disorganised and still hand things in, because someone told you three times. You can find people baffling and still get by, because the same forty people are in the same building every day for years.

What school measured was whether ability plus scaffolding produced results. It did. That tells you very little about what happens when the scaffolding is removed.

Where it usually shows up instead

The point where things stop working is almost never a classroom. It tends to be one of these:

• The first job with no structure. Nobody chases you, deadlines are months out, and the work only happens if you generate the urgency yourself.
• Living alone. The admin of a life — bills, food, laundry, appointments — has no external enforcer and no grade at the end.
• A promotion into management. The job becomes almost entirely unstructured social judgement and context-switching.
• Having children. The scaffolding you had painstakingly built for yourself gets dismantled overnight.
• Burnout in your thirties. After fifteen years of compensating at full effort, the compensation stops being available.

Notice that all five are about structure being withdrawn, not about ability declining.

The cost of the wrong test

Two things follow from treating school performance as a screening tool.

The first is delay. People spend decades assuming their difficulty is a character flaw, because the one piece of evidence they were taught to check came back clean.

The second is worse: some clinicians apply the same test. Being told you can’t be autistic, you have a degree or ADHD would have shown up at school is still common, and it is not good practice. Diagnostic criteria require evidence that traits were present from early development. They do not require that those traits produced visible academic failure.

If you were dismissed on those grounds, it is worth knowing the reasoning was faulty. Not you.