what should i do for the preperations of iit in feild of mechanical engineering?

how is career in m.tech environment science

If you mean to get admission in BTech course offered by IIT Delhi, you can prepare in two ways 1. Join a good coaching institute like Bansal or Resonanace which will provide you both quality material to prepare and quality counseling. 2. For self preparation, you can follow the following books Physi

At graduate level you need to appear for IIT-JEE Exam and at postgraduate level you need to prepare for GATE exam. There are so many institutes who can supply you the study material.When to start preparation for exams depend upon you.