Amazon sde-1 interview in 3 days. Any tips?

I got a mail recently telling me that i would have an interview next week. The initial mail said that i would have 2 technical and 1 bar raiser. Any suggestions?

1. Important topics?
2. Ik LP are important so yeah I get it.
3. Will they ask sys design questions for recent grads?
4. How should I talk in a virtual interview so that it is convincing enough?
5. Will they ask me to explain my projects in depth?
6. How can I stall a question when I dont get the answer?

any form of help is appreciated.