Core Topics to Revise Programming (Java & C++) OOP principles (Encapsulation, Inheritance, Polymorphism, Abstraction) Collections Framework, Multithreading, Exception Handling JDBC, Servlets, JSP basics MERN Stack React.js (hooks, state management, lifecycle) Node.js + Express.js (API building, middleware) MongoDB CRUD, indexing, schema design AI/ML Fundamentals (basic) Difference between AI, ML, DL Supervised vs Unsupervised learning