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Your best bet would be to enroll in the corresponding training course for the Exam. It will cover all of the objectives and more. Alternatively, you can take the Exam Objectives list and simply work through them, top to bottom, learning each one as you go. All of the information needed to learn the objectives can easily be found on the Camel website and in the Fuse documentation.
Hi Currently I am following the Red Hat EX421 Study Guide - Bryan Saunders link for the preparation of EX421 exam as well as for learning. But this post is too old, so this link is still valid for my purpose.
One more information required, whether the exam will be objective or subjective? and where can I find few sample question & answers?
I believe the exam has been updated some since that was published, however it is largely still relevant. you can find all of the information about the Exam on the Exams web page here: https://www.redhat.com/en/services/training/ex421-red-hat-certificate-expertise-camel-development-exam
I strongly recommend you read it as it contains all of the information you need to know about the exam. As for Sample Questions and Answers, you will find none of that is the exam is Performance based, Meaning you write actual code to solve actual problems. It is not just multiple choice or fill in the blank questions.