I wouldn't necessarily say that.For those of you learning from Maths in Focus, and who are aiming for a maths mark over 90%, its time you looked for supplementary material. MIF is useless.
You see 41% (about 28) of our school's 2U cohort got Band 6 and 28% (about 11) of the Ext 1 cohort got E4. Most of these guys only used Math in focus + past papers.