Mission 5 Daily Solat: Imran's Dua Diary

Oh, man! I’m finished!? I accidentally did something at school! And ‘Bob’ is REALLY angry with me.
You don’t know who Bob is! He’s the worst thug in school… no, wait. Make that in the whole world!
Ustaz said a Muslim’s weapon is DU’A. That’s why I must fight Bob using du’a. (I’m not going to survive a fistfight against him, NO WAY).
The PROBLEM is, I only memorise the du’a before meals. Oh, man!
WHAT SHOULD I DO?