I regret to inform you that I won't be able to attend today's class since I've caught a cold and I have a sore throat, not being able to speak clearly.
Sorry for the inconveniences that this may have caused you
The Consejería de Educación de Madrid has already published the certificate exams from different years that may give you some clues on what the mock exam will be doing on March could be like.
Look what I've found on how to write application letters in an appropriate style.
It is worth surfing this site in detail, since it's been created by Oxford dictionaries and it contains some helpful information on how to improve your writings.