This is a classic, but not for this simple! To overcome the Wall Jump you'll need a few things, strong triceps, decent ups, and back strength
If you are able to do some pull-up, then you won't have problems.
To reach the top you can either jump from a standing position or attack the Wall with a running start, it's up to you, both methods are good.
A little mental tip:
When you are on top of the Wall don't think to pull up yourself, instead, try to push down the Wall! As a result, all the right back muscle will be activated.
Once on the top proceed to roll over the Wall with your stomach, in a horizontal position, then jump over the other side.
This is probably the most effective methods to approach this obstacle.