We recommend that you take our Tisus sample tests. This enables you to form an opinion on what the test looks like and what is required in order to pass it.
Sample tests

You can also study the course literature for Behörighetsgivande kurs i svenska, 30 credits. This course yields the same qualification in Swedish as Tisus does, and the literature is therefore at a suitable level of difficulty. 
Behörighetsgivande kurs i svenska

We also recommend that you read a lot, both newspapers and other texts. Tisus tests the ability to acquire and produce academic Swedish in both speaking and writing, which can be good to consider when preparing for the test.