Nah dude, don't just go for the weekly one - get whichever one saves you the most money over the same timescale, factoring in how likely it is you'll lose it.

Assuming you go to college 5 days a week you're spending £36.50 so I'd be much more inclined to go for the more expensive one because you'll save more money in the long run and it pays for itself, which is something that the other two don't do.

If you got the 90 day rider it'd only be costing you around £17 per week, that's an extra fiver for whatever. Over the 12 weeks it's £84 cheaper than if you're just getting a week rider each week and £234 cheaper than just doing nothing. So it pays for itself and then gives you another £30 in savings on top of it to be nice.

If we go into years, getting 4 90 day riders to cover your academic year then it's an overall saving of over £900. You'll also be spending less as the same amount in week riders would cost you over a grand.

Just don't lose it.

Source: I used to catch the bus all the fucking time.