It's all in the title really: intensive. This subject is nothing short of it.
This is a really, really difficult subject. 16 hours of Spanish a week and an absolute shit tonne of homework will leave you stressed, tired and half-dead by the end of the course. Each day you cover a week's work (normal year terms) of content and are expected to do about 4 pages of grammar exercises in addition to, of course, revising the content and doing assignments in between. This is a really large workload and will test even the most diligent of students. So big piece of advice, of course, is that you do need to go to