I keep loosing the final battle. What should I do?

Hint 1 of 8:

Did you look at the book in the library?

Hint 2 of 8:

It doesn't help much, does it?

Hint 3 of 8:

Graham has memorized the contents, so you can cast certain spells now.

Hint 4 of 8:

Little cats catch little bugs.

Hint 5 of 8:

When the battle drags on, run away to fight again another day.

Hint 6 of 8:

Try to weasel your way out of being hypnotized.

Hint 7 of 8:

You don't aways fight fire with fire.

Hint 8 of 8:

Here are the spells to use: (this is a direct hint)