or perhaps not
Have u though about how much time you've spent waisting away losing hours of your life doing maths only to realise it equipts u for nothing in life other than perhaps a better UAI
Consider this we spend 12 years in school then at least 37 years working all to retire with...
i've got four textbooks for bizos but i reckon it's best to get familiar with diff. types of questions cauz the HSC questions have got to be inspired by something,
But even still the more Tbooks u have the more confused u can get as each one disagrees with the other