no no i did ext2 for a while,and it is totally different from other courses,3u has scaling of about 15 while 4u has scaling of about 20.Also the 4 unit course is designed so that you can't finish the paper,note no one has ever finished the paper,there is heaps of random shit in it.Like questions that uni ppl can't solve and they stuff it in there, to see if anyone can.if you did 5 questions out of 8 ,that is already a band 6 definielty.Take a look at the 4 unit overall raw assesment marks on this forum ,um no one gets like 90percent as their raw asses mark.60-70 percent is heaps gud
You also get a 100 percent in 2 unit,but mind you 4 unit is so boring the onli thing u'll be doing is maths ,if your an average student compared with the very smrt ppl.4 unit isnt that simple its uni maths no course assumes it for assumed knowledge.