I'm in the same boat.
One thing I recommend is to go into the interview with a lot of things you want to say about why you believe you'll be excellent at the job, and make sure you say this. Focusing on explaining why you believe you are the best candidate is more effective than trying to pass the tests, & such, I think
Out of curiosity / nosiness, why are you looking for a job? are you not able to make a good living from self-employment?