A quick way to do this is to choose a tomb or the first level (called the prophet's tomb) and pick someone high up on the leaderboard, you can pay 2000 credits to use their cards and if they are very high up they are almost guaranteed to be up to 200% or more.
Mine actually unlocked where I was only on +125% from cards so this leads me to believe that the score is counted in addition to the base 100%. (i.e. you didn't use cards to lower the score %). Hope this helps :)
Edit: Runner eGirl has suggested playing "Voice of God" instead as it is a short level too. I've attached a link for a playthrough of this level
Further Edit: Lockie and I would both recommend you don't pick a card with "press x to grip ledges" it is a very hard one to remember to do and there are far easier ones you can use to hit 100% (no deaths for example)