He took a while gelatinous! He said he found it hard, much harder than the practice tests - it's unnerved him. Ran completely out of time on Section 2 and made a batch of entirely random guesses rather than leaving blanks. Did your DS do the BMAT or was he doing something else?
DD2 got the wrong date for her HAT in 2009, the Head of Sixth pointed her in the direction of the BMAT, ELAT, HAT room just in the nick of time. At least DS was less dozy than that, but it doesn't sound great.