Object-Oriented Design (OOD) Interview

Interview-ready:
Tools and courses to help you prepare for OOD interviews.

Educative:
Interactive learning paths for mastering design patterns and OOD principles.

Codemia io
They have recently added OOAD sections with many questions like parking lot design, vending machine design and much more.

Head First Design Patterns Book:
An engaging book that simplifies complex design patterns with practical examples.