In regards to timing, yeah you have to move fast. If the timing is anything like the engaa then you get around a minute per question and there is sometimes a fair bit of work to get to the answer. Considering that you will have mathematics 1, mathematics 2 and physics in your esat I would recommend doing questions from the nsaa/engaa past papers under timed conditions. That will hopefully help you get a hang of the timings.
Idk, I also sat my engaa in a weird way, spending most of my time on section 1b instead of 1a. It worked for me I suppose.