>>24722303
The buildup to the critique is the tradition of the rationalist and empiricist schools during the 17th and early 18th century, with Kant drawing from the major works in both traditions. Specifically the Leibniz-Wolffian philosophy of his time. You may wanna read Descartes->Spinoza->Locke->Berkeley->Leibniz->Hume to prepare for the Critique. But to understand them, it would also be beneficial to be familiar with the Greeks. So start there if you want to have a comprehensive understanding.

Alternatively, if you don't want to spend too much time in preparation, do what this helpful chart recommends:

>>24677620
try this