For this reason I believe that IDEALLY those students should attempt Methods 3/4 in Year 11. There are 3 reasons for this :
1) You can give Methods your undivided attention in Year 11. This means that you can invest the time required to execute the study plan I mentioned in my previous post.
2) You will get a more realistic picture of what it is required of you to do well in your Year 12 VCE subjects
3) Methods is a good foundation for Specialist Maths, and it actually makes Specialist seem a lot easier than it actually is.
Conversely, one could argue that it wouldn't be the best decision to take up Methods in year 11 using these reasons:
1) Methods is more focused on grasping and understanding concepts, and then learning how to apply them. There really isn't much memorising involved, so as a result, dedicating an entire year to methods alone would seem as a bit of a waste, especially if you plan to do subjects in your following year that require you to do a lot of memorising (you should choose these subjects in year 11 when you have time).
2) If you wait an extra year, you will be more mature and will have attained a greater capacity for understanding the concepts required for Methods. Not many primary kids are taught that 1 divided by 0 is undefined, but instead they are told it equals zero, why? Because many of them are unable to grasp such a 'complex' concept at that age. Similarly, if you wait an extra year, you will have developed a greater capacity for understanding the material in Methods, and the material isn't particularly easy to comprehend. This is why one might pick up a subject like Biology in year 11, where it is necessary to memorise and understand a vast amount of material, and the concepts are relatively easy to grasp when compared to methods.
3) If you do plan on doing specialist math, doing methods along side it makes methods ridiculously easier. If you do well at specialist, the calculus and circular function portion of the methods course (which makes up to 70% of both exams) becomes ridiculously simple. Furthermore, the level of understanding required to tackle specialist is elevated when studying it, and this has a general effect on your ability to comprehend the concepts in methods as well.
If you want to get the most out of your ATAR, then for a year 11 subject, for most students I would suggest that you should choose a subject that isn't too complex, but it requires a lot of time to do well in it. This way you can dedicate most of your time in year 11 and still perform to the best of your ability. Unless you are extremely good at maths, I wouldn't advise you to take up methods in year 11. If you want to get the best possible result for methods, then doing it in year 12 will give you the best shot at getting that result, especially if you do specialist maths alongside it. Just my opinion though
