it seems like every test can be different kind of beasts.
Some test will be very straightforward, some will have very detailed questions. If I were you, I'd spend some as much time as possible for the bio section because it is so broad.
Feralis note will be a great start, but it actually overwhelmed me, so I stopped reading it about halfway.
But, knowing small little details will change your score from 18 to 20 or even 20 to 23! You just never know.