Hello Aspirant,

There no need of an advance preparation for the 1st semester in Diploma, In every engineering diploma branch the first year will be full of basic subjects , it may be a little more than what you have studied in class 11th and 12th.In the entire first year below are the subjects you would learn,so if you want you may brush up your 11th and 12th physics,chemistry and maths notes and familiarize with new subjects like engineering drawing using best prescribed textbooks or internet resources ,to make it easy for you to grasp when taught in college.You can even simply attempt previous year semester exam papers to know the pattern of questions and to know where you stand .This can be done once the classes start so that when your actual exams come , you will find it easier. The subject syllabus may vary with every college so, kindly visit the website of your college and go through the syllabus and starting reading with whatever material you have until the classes begin.

1st year subjects:

Basic Mathematics

Basics of Computer Systems

Chemistry

Organic and Physical Chemistry

Engineering Drawing

Physics

Applied Mathematics

Communication Skill

Development of life skill

Engineering Mathematics

Workshop

All the best