Thinkcore Technologies interview questions

There will be 3 rounds 1) programming (medium) String and array concepts based questions 2) programming (difficult) and SQL Queries and some MCQ questions based on Java and javascript 3) technical round 4) HR

2 Coding rounds 2 Tech rounds The process took about 1 week. 1st coding round was pen and paper. The difficulty level was average. 2nd round coding was conducted online had difficult level questions Technical round had programming questions again. I was asked to implement LL on Notepad using java. Which i did sucessfully but still wasnt selected.