Any IQ test that is not administered is bs. Basically, if it is an online test you can pretty safely say it doesn't count.

Used to be at some point in middle school you could elect to get testing. You'd go in, sometimes on a Saturday (so not many takers) and it would be proctured for 8-12 at a time.

There are many metrics and methods, good ones take test time observations into account.

They can include motor function, hand eye coordination, critical observation, general knowledge, etc. Not many take spelling into account, and tests vary as even smart people can be bad at traditional pen and paper tests.