depends if i needed the last subject! in year 12 2 of my closest friends were only doing 3 subjects so they had lots of spare time, this prob did bother me a tad! in yr 13 you get so many frees anyway it doesnt matter! one of my friends is only doing 2 subjects though so she had loads of frees!
I do IB, so similar position with my A level mates.
Sometimes I wish I had some down time etc, but to be honest at least I'm not wasting my time - it's satisfying to feel that I'm actually learning as opposed to dossing around in the library half the day (as the A levellers do during their ridiculous number of frees)...
I had this so I had no free-periods with anyone and so I didn't see my friends at all in school (we all go home at lunch break at 1.05pm). It didn't bother me too much though. If I'm in school I may as well be doing work.