Yea good question, I have no idea how I got the .21, but thats what I somehow got! Although the unit outline said it was out of 15, the only explanation for getting a decimal is that they marked it out of something higher and then scaled it down?
The test in general was ridculously short IMO, I knew a couple of people who only finished the ledger and didnt do anything else. Personally, I had time to go over some of my early stuff ups in the ledger (which took like 10 mins - but it still wasnt 100% in the end) and I still had to time to put in a rushed tial balance and P & L statement.
On the topic of uni 'mistakes', one of my friends got a running balance ledger instead of one in the T account format in his exam!!! Sounds minor, but the running balance is alot easier as its all put out clearer, while the T accounts in the exam gave no space to put all the details required in and then you also had to work out the balance b/d etc seperately which took extra time. Not a very even exam!