I'm a fan of the Pod Chase mode.
Sure it takes a lot of made shots to complete, but you also have plenty of time.
Upgrading that mode qualifies most of the other shots to count towards the mode making it even easier.
The key here is to get in the groove of shooting ramp combo shots. I know I'm having a good ball when I can knock out have the mode in one extended combo shot. Getting that timing down is useful for most of the other modes as well.