"The first half was not good enough by our standards," Jol told BBC Sport. "We gave away easy and cheap goals and we have to change that.
"We haven't been that good recently since getting the 40 points. We have to get some more points.
"We said our goal difference was probably a point but that has changed in the last few weeks so we need a couple more points."
Fulham entertain Liverpool at Craven Cottage next Sunday.