Detailed Review Of Preparation

First thing that I should point is I'm not a good writer, but I will try to help you guys!)

So, in order to pass my AWS Associate Solutions Architect examination I have prepared about 3 months. Before starting to prepare, I put some kind of deadline(it really helps). Some people even registers for a specific data(but you can always change it).

•  I have started learning with A Cloud Guru (https://acloud.guru). This guys explains very well. Make sure to take notes, at least exam tips.
•  Then I was watching Youtube video courses from Denis Astahov at ADT-IT channel (https://www.youtube.com/channel/UC-sAMvDe7gTmBbub-rWljZg). This video course is in Russian. 
•  The 5 pillars of the AWS Well-Architected Framework(https://aws.amazon.com/ru/blogs/apn/the-5-pillars-of-the-aws-well-architected-framework). These whitepapers explains best practices and services in deep.
•  Whizlabs.com in order to take practice tests. 

GOOD LUCK!!!