LA prepared me very well for this exam but there were still some questions I had to make educated guesses on. Before I hit submit I was SURE I would be greeted with a "FAILED" message. I was thrilled to see a pass @ 83%!
You may not get questions on these subjects but I think if you're getting ready to take the exam it's worth adding these items to your pre-exam review, being very general here because of the NDA (and foggy brain from 4 days ago):
SQS! - If you don't have a firm grasp on the default settings and behaviors you're not ready to take the exam. I had a large number of questions on SQS default settings like the polling behaviors. I knew this going in because of the LA practice exams. be sure to really understand SQS before taking the exam.
Kinesis! - I had trouble with this even on the practice quizzes on LA so I knew going in I would have trouble. Specifically you should know a few use cases for Kinesis, understand the components, and understand the differences between Stream, Firehose and Analytics.
API Gateway - Know the benefits of using it. Know common use cases. Know what CORS is.
RedShift - Know what it is and the use cases for it. Understand how it differs from DynamoDB. They will have questions where if you don't know RedShift is a DataWarehouse you'll be unsure whether to pick RedShift or DynamoDB. I couldn't remember what RedShift was so I had questions I really struggled over.
DynamoDB - Be sure you know how it differs from RedShift and RDS and the benefits it offers (low latency, automatic scaling, etc)
OpsWorks - This was not covered in the LA SAA Coursework but you'll want to know what it's for and that it can use Chef code.
As I'm starting to go through the AWS Developer - Associate coursework I'm seeing a lot of the info on the questions that stumped me. I recommend plowing through the Developer coursework prior to taking the Solutions Architect Exam, it's only 13 hours which is less time than I spent reviewing the SAA coursework before the exam. I think if I had, I would have breezed through my exam without as much head scratching.
I do have a lot of background knowledge with EC2 and VPC Networking so a lot of those questions were no issue for me. If you don't have a lot of experience troubleshooting VPC networking, spend some time there. The VPC Troubleshooting labs are stellar, use them! As with the LA quiz, they like to ask lots of "Why can't this connect?" questions that have obvious answers if you remember the troubleshooting steps provided in the LA coursework.
The stuff I really struggled with were AWS Services and nuances around their configuration for specific implementations. Here, knowing the usecases for each service and delving into the nuances of the configuration is key to getting some of the questions right.