I will leave the details to the expert advice you received above, but quick add: no, the cognitive test will not pick up on dyslexia or such issues. These need to be teased out separately.

I've found the IDA fact sheets good summaries that stick to the facts (be forewarned, most dyslexia websites tend to get a little carried away); there's one one testing towards the end of the list: http://eida.org/fact-sheets/