I thought it might be helpful to others to share my experience with the SDS test. I chose that one as it got the certificate fastest and it was indeed fast - I had it by e-mail less than 48 hours after finishing the test and in the post a day later.
The test itself seemed like it was probably easier than other language tests. I expected to pass at B1 and got B2. Some advantages to the test:
- The format of the test starts you off very easy (A1, click on the picture of a tree, etc.) but moves up quickly if you get things right.
- In the writing section there is a basic spellcheck - it won't give you the correct spelling, but highlights it you have spelled a word incorrectly. Useful to help you avoid typos.
- The examiners gave very thorough instructions at the start and seemed friendly and to genuinely want everyone to do well.
- The test assesses you as you go so if you are only A2 level, for example, the test will stop after you've got a few B1 questions wrong. This means you would have a shorter test and not have to waste ages answering questions you don't understand.
And some downsides:
- It's done on a tablet so for the writing section you have to type everything on a touch screen (no keyboard). Fine for A1/A2, but a bit laborious for the longer B1 and, especially, B2 writing sections.
- The headphones are not very good and so you can hear a lot of sound leaking from other people's headphones. It's also quite a noisy test environment as people get up and leave at different times as they reach their level and finish the test or get taken for their speaking test. The venue I did it in was a small room with everyone on one long horseshoe shaped table so very close together. Might be better in a larger venue.
- If you get to B2 in the listening sections you can only hear the audio once, which made the above a problem. I missed a few bits just due to not being able to hear clearly over the background noise.
- There was a lot of waiting around for the speaking test. Not sure if this was just the set up on this particular day/venue, but there ended up being a queue of about 15-20 mins to do the speaking section, which then felt a bit rushed - presumably to get through everyone in time. I think in some tests like Goethe there are two people in the speaking part. In this one it was just one examiner and one test taker at a time.
Hope this is helpful for others!