All take home test and one virtual interview explaining what you did in round 2. All problems were from leetcode. If you get your basics right you would be good for grad level.
I applied online. The process took 3 months. I interviewed at Amazon in Sept 2021
Interview
Online application process, which took them over 3months to respond to. They offered a group interview but as the process was so slow I declined. Online system was as expected
Interview questions [1]
Question 1
Asked for Expirence, CV and for a cover letter via online platform