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Do the official course and practice exams.
The official course is the one available on the platform of AWS Training or Google Cloud Courses and Training. They offer a path of courses that you need to do for taking the exam. Apply for that and have some discipline for watching then constantly, taking notes. Having a group of colleagues is a great plus here, so you can follow-up, discuss some topics, help each other.
It’s a lot of content, though. So, do not be too rigid with yourself about covering everything. There are a lot of topics that you probably already know. For those, I simply skip some of them, and stoped with it seems to be something relevant there I didn’t know yet. In the other side, there may be very good material that you will want to learn more. For example, in AWS course I remember having a great talk about Recommendation Systems that just got my attention. I watched it almost entirely. While there were some videos about Gradient Descent, that by this time of life, I think I had enough.
The second and most important tip, do practice exams. Buy a few tests in websites if you can afford or ask for colleagues. You will feel much more prepared for the exam and it will help you assess which areas you lack studying. There are some great exams with commented answers and references, you can go deep on the ones you were wrong. I remember that I was struggling about real-time models, in AWS there’s this Kinesis solution for streaming with a lot of different last names: firehose, streaming, data analytics… Then I start reading documentation about each of them and became more clear what the function of each.
Final remarks, I always preferred seeing the certification path as an opportunity of learning, discovering and having fun. For me is easier to handle this way, then forcing myself into doing it because I MUST, to please my employer or future job interviewers.
So thanks for reading my article, and happy certification!