If you're going for the 100% completion, this will come naturally while scanning everything and you should end up with more experience than necessary.
If you're like me, however, and didn't want to find all the secrets, you'll likely be left with a few skills yet to unlock by the story's end.
The grinding spot I found quickest and easiest to use while still yielding good results was on Dathomir by the Brother's Bastion save point post-game (when the enemies have changed and are no longer Nightbrothers there). It's pretty much a straight shot forward from the Mantis. Screenshots attached:
Make sure to unlock the Lightsaber Mastery and Delay Combo skills to make this quick. Equip your double lightsaber and kill the two mobs by the meditation point, then run up the stairs and kill the next two. These four kills will yield approximately 5% of your experience bar and grinding one full level takes 7-8mins, depending on how fast you are.
Avoid the temptation to Force Push enemies off the ledges. I found I was often not credited their experience when I did so, resulting in a loss of efficiency.