my timetable's similar to yours in that i have all my lectures bunched up together and ALL 4 of my tutes are one after the other on a friday because they're in the same building so i figured convenience and save time. the way i see it is that if you can manage yourself with your timetable then...
this is what i did for 16cii which seems to be different from everyone else...
using i) 4c = 1 +4r^2 rearrange for r
r^2 = c - 1/4
c > r
c^2 > r^2
c^2 > c - 1/4
c^2 - c + 1/4 > 0
(c - 1/2)^2 > 0
c - 1/2 > 0
c > 1/2