Instead of really preparing for the apocalypse in a safe location he would rent with a quick loan using a shark loan (for ex), he's going back to the 3rd floor of his dorm and SLEEPS (wasting precious time). Dorm that is closed by keys at night, and of course keys he didn't bother to get. Way to go making yourself in a prison full of zombies for the first day of the apocalypse.
Instead of buying a mask/more protections, loaning a sturdy car/van, and load this car to the brim with everything he'd need, like lots of provisions and gaz, he only buys dry biscuits, some jerky and water enough to have in a BACKPACK.
Instead of beginning his voyage to his parent's location (his first goal), he GOES BACK to his dorm and instead wait for the apocalypse, completely wasting the whole time he could have used to begin traveling in safe roads, before the apocalypse.
Instead of buying something easy to transport and handle, he buys an actual AXE, which is kinda making him panting as it's too big and heavy for him.
Instead of changing his soon to be useless paper money to something more useful like maybe gold, he doesn't care about it.
For example, Lyle helped the MC to make bombs without asking for anything in return, and after that always being with him in his business. Or the MC negotiation skills being non-existant. Or the Earl they see in Est being super polite with someone who is basically a nobody.
there are bombs, and he is able to create them just like that. No explanations. Last time I checked, even an engineer would find that super difficult without any prior base industry to lean on. And also, NO ONE thinks this is great for wars? And outside of that: gunpowder is invented, but no one cares until he does something with it???