I just got a private message from a complete newcomer offering to pay me for writing the Picaxe Basic code for a school project for him and his group. He indicated that the project would be going to exam. Here was my reply
If you are contacted, I suggest you reply in a similar manner.Name Redacted,
I would not be interested. What you are proposing is unethical and I will have no part in it at any price. Besides that, if you are willing to cheat for an exam then I imagine that you have no real intention of actually paying anyone after they did the work for you.
I suggest that you and your group study the Picaxe manuals and do the work yourselves. You may also want to consider taking a course in ethics.