I used to prepare for them using CareerCup and doing problems on either HackerRank or Google Code Jam's practice problems. Now though I usually don't even both

I used to prepare for them using CareerCup and doing problems on either HackerRank or Google Code Jam's practice problems. Now though I usually don't even bother and just go to them; I think that after you studied for them the first time you kind of already know what to expect, and the interviews themselves kind of prepare you, so usually I try to schedule interviews I don't care about as much before the ones I really want to do well on. The scheduling also helps because for the first one I might be nervous but if you keep doing it I think your body just gets used to it and I honestly kind of stop caring whether I'll get in or not. it might sound counterintuitive but I actually find that the less I care the more likely I am to do well.