Fixing up some jumps

Hey guys i recently found some old table tops and doubles that are pretty old and wethered adn just need some leveling out this sounds like a dumb question but what would be the best way to get tehm perfectly even? theyre pretty damn big.

Thanks in advance.

where are you located ..... id just water it down and flatten it out after the first day you will probably hit it in the same spot constantly

Rent a small tractor and a box scraper. You can fix them however you need to then.