SilkTest Question:

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First of all it is very expensive ....( it cost around Level 1 - $150 + training - Rs 15000 +level 2 - $200)
Second you will learn indepth of silktest in the advanced training which is compulsory to take level 2 exam. Personally I felt this is useful even if you have 5 yrs expericne in silktest you will learn more about complete tool.
Leavel 1 is online and they did not change the question papre for long time. I know few people who are scoring more than 95% just because of that.
Segue certification stratagy is not that great like mercury I felt very bad when I heard few people who doesn't know anytihng about silktest test did their certification. (In india it too bad, I have no idea in another contries).
Sad part is there I konw some people who are able to take exam without paying fee also :( ( guess how strong their training division is )
Finally certification is only useful for decorating your cv. If you really have hands on experience in the tool no need go for certification.