Mock interview with Shivam Jalotra

will help you figure out

a) strengths

b) what to improve and where to read things from

example in LLD usually you have to do this :

1. Class Diagrams (Use SOLID while creating these)
2. APIs, Access Pattern Deep Dives
3. SQL vs NoSQL (Why one ?)
4. Writing clean code.

See a sample here : https://github.com/jalotra/machine_coding_example