Or, if you are interested, try reading something a little
deeper, like some texts on politics or something along the lines of
that. I've got a friend whose GP improved by miles just by cramming
those books those. But honestly, if you read ST, skip everything
else and go to the review section.
Btw, promos is actually not as scary as you think. I'm having my
prelims now and my A's in 30+ days time. Now THAT is raw hell.