Copy of A Deal With The Moon

You made a deal with a white cat with an X mark on its forehead. For one billion dollars, you accepted to time travel to one million years ago. You are given a choice to pick your desired form, one that will never change whatever you do but can still store strength. You are given 10 days to prepare anywhere you want and after that, you will be sent directly one million years in the past. You need to survive alone with nothing but the knowledge you prepared to have. You are also given abilities: Form customization(one time only), Mind library(anything you decided to learn in that 100 days will be forever in your mind, unforgettable), and mind acceleration (your thinking speed will be 7 times faster).