I tried studying through different means, however, studying through EC-Council ICS/SCADA mock tests is the best thing to do. I was quite glad when i came across the features that support the unlimited attempts. I could compare my performance and try to better it with every attempt. ICS/SCADA syllabus is not that tough or lengthy. However, it requires the right approach and this is what i gained by giving mock tests daily.
ICS/SCADA Certification Syllabus
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