My laptop seems to be acting weird. The left shift, s, x, button don't work properly. I have to hit them more than once for it to show up when I'm typing.. Any suggestion how to fix this problem?

Try cleaning those keys. They pop right off, just pry them up, clean under them (canned air or a vacuum cleaner, or if it's real bad get a toothbrush) then pop them back on.

The keyboard may be going bad too. If that's the case, you could pick up a usb keyboard and use it. A new keyboard replacement for a laptop can get pricey (unless you do it yourself, it's easy but you have to be fearless ha).