It's a tough exam but if you know the LA material well then you have a pretty good shot. I feel this site was an immense help and I would have failed without it. It does a great job of covering the exam material.
Some general tips:
It's a long and tiring exam: I highly recommend you take this exam when you are well rested. So not after work or after a day of study. It's 170 minutes of long questions and answers. It will test your comprehension skills as you are under pressure to read long and complicated questions. The last hour really tests your concentration.
TAKE THE AWS PRACTICE EXAM. Yes it costs money but it's a lot cheaper compared to failing the real exam. Honestly this exam actually helped me a lot in the real exam. I only got 55% on my first try. I studied for a couple more weeks and then got 65%. I got a much higher score on the real exam so do not let a score like my one put you off. Some of the practice questions are hard to understand but it was good practice. The questions give you a good feel for the real exam. I found it helped me find my weaker areas. For example I got a 0% on cost when I first did this practice exam. I figured out I wasn't paying attention to context of the question and did much better the next time. For example "recommend the most cost effective solution", I kept going for best design regardless of cost considerations. I think the EMR section on LA really drives this point across.
Learn STS well. You need to know the STS steps very well. AssumerolewithSAML, AssumeRoleWithWebIdentity, custom ID brokers...etc. Know the high level steps and how it all fits together.
Learn not only VPC and BGP but AWS route propogation. http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_VPN.html#VPNRoutingTypes
Learn VPC CIDR IP rules. How many addresses AWS reserve per subnet. https://aws.amazon.com/vpc/faqs/
Learn high level mobile push http://docs.aws.amazon.com/sns/latest/dg/mobile-push-pseudo.html
Anyway those my general thoughts. Best of look to anyone studying for the exam.