We got through with some of that hard work and determination we've been mentioning...we got through because we have the right attitudes. People are insulting you because of your attitude and the way you are speaking to people on here...treat others as you wish to be treated yourself.
The point we are trying to make is they are not trying to catch you out, only trying to work out who will be suitable for the job and if you can't hack it at stage 1 then the writing is on the wall...or in the test results..
I was in a similar position to you...GCSEs 12 years ago, no DST for longer probably and all of a sudden there is was in the tests, but guess what? I completed the tests and now I'm through to college. So what if it comes up in the paper and you didn't know! If you completed it then what's the problem?! If you can't do the simple DST questions then the job isn't for you...
Simples.