It sounds like you are set for a Neuro Psychological Assessment. These are very common when trying to measure the functions of brain injured individuals.

As you said, you think you will fail miserably at this. That is the whole point. Failure is a good result if the failure is validated by the validity tests.

This is not a face to face test. Most of the tests are short and have a narrow focus, like tapping your finger as fast as you can for 3 minutes. Trying to memorize information. Trying to re-order information, spell or count backwards. Do a pencil and paper tracing test. Assemble a unique set of blocks. You will be observed more than questioned.

Who has ordered this assessment?

SSDI does not usually require a full NPA. In fact, they have psych's who will do an abbreviated assessment of an hour or so.

It has not bearing on SSI. That is needs based.

Do you have an SSDI attorney/advocate ?

I have had 2 full NPA's 3 to 4 hour, and one abbreviated 1 hour, NPA.

So, relax, if you don't sleep well the night before, that is OK. It will only help.

My best to you.