Congrats!
First thing first if you put in the time you will qualify! Second don't let anyone intimidate you a lot of the program is break or make game, just go with the flow. The less you question the logic the easier it will be.
Phase I is going to feel like eternity! you will need to remember dozens of paragraphs verbatim. Get the definitions, indications, signals and notes down as best as possible. No time to learn those when phase 1 starts.