i have tried to meditate before. i have problems focussing. its like my mind wonders. how can i focus better and stop wondering?

in meditation, do not concentrate... instead u should let the mind go...
if there are some things to think... just let it wander...
it looks hard at the first time... but after some times u'll feel it more easier...
BTW u can find more and read more in this forum

Are you suggesting to let the mind wander until it simply runs out of things to think about?

One anology is to allow the mind to drain like drops of water settling.

Another is to treat the mind like a child. You have to allow it to be wild and run around of as long as it needs to and then it becomes ready to settle.

Allow the mind to wonder. But observe it, same as you would a child.

Meditation literally means:  To Think Upon.  That means that meditation is not stopping thoughts, so much as redirecting thoughts.  

This is where visualization can be a good tool.  Visualize in your own mind a place of peace (from nature) and when the mind wanders, and it will, return it to the same place until it rests there.  

Do not continue to return the mind until it becomes annoying though.  Practice slowly and steadily and gradually increase the time you remain in meditation.

When you can return to a conscious state refreshed is the key to meditation.