I am recently preparing for some exams. And i have bought the official study guides. Are training courses necessary? They are very expensive. If they are not necessary i don't want to take them.
It depends on how much time and effort you are willing to devote for your exam preparation.
I suggest you first go through the official study guides and see if you are able to understand what is provided there.
If you feel confident enough that you can manage on your own based on the give official study guides - that is it.
Otherwise you may have to enroll of training course in a reputed training institute.
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