You do you have to make sure you have time and concentration as the programme is tough in terms of material to go through. You do need to make sure that you have 4 weeks to fully concentrate. Combining holiday and this course is not advisable. Making the lesson plans is really good to understand the flow of the CLT method. Also, an excellent opportunity to perform teacher practice. This is the key to success. In advance really do study grammar already as like many people I barely remembered any grammar and it is necessary to be able to support students on this journey as well as speaking.