Didn't go to any lectures, however I heard that they weren't that uesful, tutes don't help much, basically they don't cover anything in tutes, you just do your own work and ask some questions if you got trouble. Most people who do this unit are probably thinking of majoring in pure mathematics, so self studying would be the best. Exams sometimes don't even relate to what you learn, and what you learn don't even get tested on the exams. However it is a good unit for those who like pure maths and would like to do reading beyond what's required and just have a passion for number theory/algebra in general. So in summary to enjoy and hopefully do well in this unit, you should do lots of private study, study beyond what's taught.