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Well last one first. Yes! you can sit for exam first and then can go for course. It gonna be ok, after you sit for course.
For the first question, well, try to do every possible thing. Go through white papers, as lot of question might come from theorical part that you never need to do in your lab practice. And when you are ready, you can feel yourself. So can go for exam directly.
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For the first question, well, try to do every possible thing. Go through white papers, as lot of question might come from theorical part that you never need to do in your lab practice. And when you are ready, you can feel yourself. So can go for exam directly.