I'm going to downgrade my evaluation of maths tutorials so far from educationally useless to having negative educational utility (for me, in both cases). I had to go in just for a tutorial, both yesterday and today. In an hour, I got through about as much as I would in 20 minutes if I were studying on my own. Yesterday, I drove in and parked there, so the travel time was 30 minutes and the cost was $4 for the parking and about $5 for the petrol. So I got 20 minutes worth of study done in 90 minutes and it cost me $9. Today, I parked and bussed, so the petrol cost is a little less, covered by the extra bus cost, but there was no parking cost. However, the travel time was doubled. So I got 20 minutes of study done in 120 minutes, and it cost me around $5. I justified the extra 30 minutes by thinking I'd work on an assignment in the labs after the tutorial. But unfortunately MatLab would not work in the labs, so I had to come home to use it.
If these were outlying data points I'd ignore them, but unfortunately, I have not yet had one single tutorial out of the 20-odd I've now attended, that were worth the opportunity (and real) cost. So far as I can tell, they exist to extract free tutoring out of the motivated students, to give it to the other ones.
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