I have prepared from various sources for the examination(including official sources ), and I was able to understand most of the concepts, but then I came across some 260+ questions over the internet, and I was not able to get most of them. So I'm feeling a bit confused and underconfident with my preparation. Can anyone help me out with the genuine sources on which I can rely and question banks for the preparation? One issue with the quiz part is that most of them are too expensive, and I can't afford them at this point.
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