I think it is worth it to buy a course on Udemy as well as some practice tests, if only to make sure you know the content. The cost of that is going to be much less than the cost of the test if you end up not passing and having to retake it.
2 weeks is more than enough time to dedicate 1 hour (or more) a day to studying and grinding out on practice exams until you feel like you could pass in your sleep.
