If you are in Freepass at fortnite level 35, and then buy the Battlepass, you will also get level 35 in the Battlepass?

Is already above, thanks for any answer.

In the Battle Pass info, if you should get it, you'll get all the rewards back to your current level. To answer your question: Yes

Have the Battlepass now almost thanks to your answer! Am level 90

I'm glad. Then you only need 10 levels and then have the ice king skin.