@msaikris143 - The dumps will not help you to gain any knowledge other than testing your memory to remember English sentences by heart without knowing their actual meaning and context :-)
The intention of doing a certification is to make sure that you have learnt concepts of Talend development in a structured way and it is a way of measuring your knowledge. I hope you are doing the certification to increase your knowledge (which will not happen in the case of using dumps) and/or to crack any technical interviews in Talend (any good interviewer will understand in 5 minutes whether you got certification by dumps or not).
So my recommendation will be to always go by the structured way of learning rather than trying the shortcuts.
just to know the difficulty level of exam if you have dumps can you please mail me firstname.lastname@example.org
Could you please refer the below link to get more details about training opportunities available for you before attending the certification?