Do they require this for the C-Permit now?
I just got my Certificate "START DEUTCH 1" yesterday.
This was the Level A1 exam and I got 95 out of 100.

Am quite chuffed with that.Had to do 60 days of intensive German
classes to get this.Monday to Friday 3.5 hours a day.
It takes another 60 days of the same to get the level A2 certificate.
I would say that it will be difficult to get the certificate without the classes as they prepare you for the exam in the classes.You need to know
what they will test you on.
Also the exam takes the whole afternoon and consists of Hearing,Speaking and Writing.There are some group discussions involved as well
with two examiners present.Gramar is important.Then it takes about a month to get the results.