1. real life example of class and interface 2. Some question on OOOPs concept 3.differece between Recursion an DP 4. write code for finding node in Binary Search tree whose difference with a given number is minimum. 5. Write sql query, given 2 table customer(cus_id, name) and order(order_id, cus_id, date) print the name of customer who ordered maximum in last 1 month. 6. correct order of having,groupby,orderby. 7. Sql is most important.