There are no "cheats". What would you even want to cheat in this game, changing relationship status for instance fucks up your save file.
You've made a mistake. It works for me, delete both patch files and re-apply. It works 100%.
Go to the beach shop and then click on the arrow on the left side of the screen to get to the beach house.
Second actually. The company name in the safe is #2 and only unlocks after you've found number 1.
You need to make progress with mom and dad beforehand. Exhaust all their options before talking to Judy.
First page, post #3.
It's meant to be used at home not at school.