||Double posting wouldn't help much. Anyone who can read your second post can also view your first :)
As always Google is your best friend.
You didn't specify if you are talking about Amazon India or abroad. If its India, a few of my ex-colleagues are senior architects at Amazon India and you may bump into them. From whatever little I know about them, if you can consistently solve Div-2 500 problem and a few times at least figure out the logic behind Div-2 hardest, you'll have a good chance of doing well. Be confident. All the best.