I can't remember if I did all of them, but I know it wasn't a problem because I had all the answers in the FFVIII guide (which young me thought was the greatest thing ever).

Quote Originally Posted by Loony BoB View Post
Were there any ways to boost your rank without doing a test?
I think it raised if your characters had a high enough kill count in between payments. On the other hand, it might have lowered if you didn't do much besides walk around in between payments. Certain fixed events raised it, such as how well you did at uncoupling the train cars.