Diploma in Electrical and Electronics Engineering 

at Buddha Polytechnic College, Gorakhpur

Books that you can explore during your BTech Mechanical Engineering are here. Take a look

• Textbook of Engineering Mechanics by R.K Bansal
• Industrial Engineering and Management by O.P. Khanna
• Fundamentals of Thermodynamics by Richard E. Sonntag
• Mechanical Engineering Design by Joseph Shigley and Charles Mischke
• Manufacturing Engineering and Technology by S. Kalpakjian and S.R. Schmid

Hope it helps.

The subject that is tough for you might be very easy to study and grasp for your friend, who finds it interesting. For example, you may find Electromagnetic Wave Theory very tough because of the various technicalities and Engineering theory that it deals with. But, for your friend, it might be fun to learn, as it gives them a channel to learn, explore, and experiment with something new.