Text Formatting ⇒ How do i remove whitespace at bottom of landscape page?

[thedreamshaper]

I have created a nifty little "cheatsheet" for students, but it needs some serious cleaning before it can be used i think. Specifically how can i do the following:

1. Make use of the huge ammount of whitespace on page 2
2. Keep paragraph headlines together with their text (tabulars)

I know what i am using is a huge mess of things, but it mostly works ok. I have attached a zip file of everything i use, including a .pdf to show the problem

10^3 thanks in advance! :=)