E-learning exercises and lessons

As an educational publisher, Van In educations offers to their customers integrated digital exercises and lessons. The output generated by the authoring tools should be revised. We ask you to design three different exercise screens and two lesson screens.
Please read carefully our instructions: http://ns22335.ovh.net/~lever/elearning.zip

Desired Color Scheme:
Neutral colours

Desired Style:
Simple and clear

Accepted File Formats:
psd

Introduction
As an educational publisher, Van In educations offers to their customers integrated digital exercises and lessons. The output generated by the authoring tools should be revised. We ask you to design four different exercise screens and two lesson screens.

Design for a specific target audience
The target audience for the lessons and exercises are secondary school students (age 12-18). The design should be appealing, but it should be clear that there is a difference between e-learning and having fun on the internet. Therefore the design has to be simple, with the content being the most important element. Besides both navigation and other buttons should be large enough.

Example exercises and lesson screens
On http://ns22335.ovh.net/~lever/elearning.zip you will find the four exercises (html) and some lesson pages (pdf) with some extra instructions. All the elements present in the exercises or lesson screens should be preserved. It has to be possible to integrate an exercise in a lesson page.

Colour scheme
All screens should only use neutral colours. The exercises and lessons are used as a part of different brand products. Each of them has a different colour scheme, an own logo, which should be integrated in the lessons and exercises. Therefore the colours of the exercise and lesson pages should be low profile.
No dark designs allowed.

Please make 2 designs: 1 exercise and 1 lesson. Based on these 2 designs we will give feedback.
If you win this contest you can make the other pages.