Yes, the Polytechnic in Mechanical Engineering diploma is very useful if you want to pursue further studies. After completing the 3-year diploma, you can apply for lateral entry into the 2nd year of B.Tech or BE programs in Mechanical Engineering or related branches like Production, Automotive, or Industrial Engineering. This allows you to save one full year compared to starting a regular B.Tech after 12th grade. The diploma also gives you a strong foundation in practical and theoretical concepts, so you are better prepared for higher-level engineering courses, projects, and research. Additionally, it can help you balance work and study if you choose to take internships or part-time industry training during your B.Tech.