CV and motivation letter.
A good preparation before signing up for a mobility module is to prepare a Europass CV. You can create it online or download the template here. You can get instructions in your own language but of course you have to prepare the CV in English.
You are also asked to submit a motivation letter. In the motivation letter, you should introduce yourself and tell what you hope to learn from the mobility both professionally and personally and how it fits in with your line of education.
Ask you teacher for assistance – it should never be the task of preparing the CV or motivation letter that keeps you from signing up.