>>10910595Physics. Math and physics.
Math is a universal foundation all those sciences. Physics will let you see why the fuck those two particles go in such a way (shh lowest energy principle), which extends to all, believe me when you get to selectiveness you will be better off with physics than without.
For biology no shit you better have some knowledge of economy - all the organs and hormones are responses just like on free market.
However beware becoming a polymath is fun but you will never attain anything of note. That's the truth. Maybe economics with quantum physics for information dispersal is a field that has something to say for polymaths. Imagine having an idea in 2013 that was made into a pro paper in 2018 that is same as your thesis that you can't finish to this day.
TL;DR In sequence : Math then physics, chemistry, biology. Don't get your hopes up.