Hi Rhitik,
I found the Weekly Challenges useful when preparing for the exam - also use the Core certification learning path which will take you through the tools you are likely to be tested on.
As you can take the core exam as many times as you need, I'd recommend using your first attempt at the exam as part of your preparation - you don't necessarily need to try and pass first time!
Once you've done a few Weekly Challenges, have a go at the exam and see how you get on. You will also get a breakdown of how you scored on different areas, which I found very helpful for targeting my revision/preparation time as it allowed me to focus on the areas that I needed to develop.
Good luck!
Nicole
