How do i make my brain to work faster and increase my level of alertness?

Play brain games: I'm not sure exactly what type of trouble you're having with your brain that you feel it is slow and your alertness is decreased. Perhaps, a check with a neurologist would be best just to begin with to make sure all is well. But assuming you're just not up to the kind of snuff you'd like to be how doing something rather simple and fun like checking this website out: www.lumosity.com. I LOVE it!