In Brain Quiz, the main goal is to score as many points as possible within the span of twelve minigame cards.
Certain minigames have an immediate answer and an immediate response, meaning there is little to no animation between the answers becoming selectable, the optimal answer selection timing, and the checkmark. As a result, very little time will tick off of the minigame's timer. I am able to use several of the minigames to my advantage due to them having this convenient quality, at best scoring hundreds or even thousands of points. This isn't shown in the YouTube video, but I start off the Brain Quiz by exiting and entering the game again hoping to get a better set of cards. I did this until I made sure that two of the higher scoring minigames, True View and Odd One Out, are both on the board with reasonable difficulty (the more challenging these two are, the better; more time is on the clock this way).
I have timestamped each minigame in the video, along with the scores from them. Also in the description is a Google Sheets I made that shows all individual Brain Quiz TAS WRs from both my TAS and sock puppet's (now obsolete) 644 points TAS.