Snake is right. The course is quite easy to finish. Can take 2-3 days if you are dedicated enough.
The problem is being Rank 1, being Rank 1 in most years has guaranteed you a 50, if you drop 1 mark maximum. It has been the case for the last 2 years, I dropped 1 mark, still got a 50. Whereas Rank 2 at my school dropped 2 marks, got a 47.
In addition, this is why you have to be the best at Sac marks, you have to either ace them 100%, or be the top at your school.
Just spend the whole year trying to eliminate the common mistakes you make, and find alternative methods to complete your questions, to ensure that once you have an answer, you can arrive at it another way, so you have the technical method, i.e Calculator, and then the regular working out method, as well as a third testing method...
I think I will be writing a book about this, we'll it is something that I am currently working on, as to ensure that once a student arrives at a answer in a module, they can use another method apart from the calculator, to check it. There are many ways that I have found out this year, I was thinking about writing a book so as the Further Students of future years can use it as a theory book. Its sort of advantageous to me that I did all the modules, because I was bored, and I regularly helped other Further kids from other schools, so I have more than enough short cuts in all modules, except for Networks which is difficult to exactly check.