Here's the Light on EX or Synchrogazer on Hard/EX difficulty are some of the highest scoring songs you can pick.
When you get close to the score you need in Free Live, purposely fail the song. Notes are worth 10% their normal value when you have 0 health so you can finish easily.
The "Flexible Team" option gives you the fastest park, but at the expense of more voltage.
See any issues? Contact Mirby#5516 on D4DJ discord.