Electrical Engineering

As per the rules, you don't have any type of restrictions. You can opt for any PG course after BE.

Regular study for Diploma engineering may be a problem for you. You better try for AMIE. Clear Section A and Section B. After clearing all the papers of Section B, you will be recognized as a Graduate Engineer i.e equivalent to B.Tech. Best wishes.

Best colleges in Pune for Ph.D. in electrical engineering is College of Engineering, Bharati Vidyapeeth University, Pune Satara Road, Pune.

Government College of Engineering, Amravati
Government College Of Engineering, Aurangabad
Government College of Engineering, Karad
Government College of Engineering, jalgaon
Government College of Engineering, Chandrapur
Government College of Engineering & Research, Awsari Khurd
Government Engineering College, Yavatmal

You may consider foreign authors books named "Calculus and Analytical Geometry” it has good variety of questions. You can also consider book named Thomas Calculus, just check them once if it could be helpful.

For Master's degree, you need to have an aggregate score of around 70 percent with good GRE and IELTS score. Getting PR then is very easy. But to get through these universities is a bit challenging task.

Try to do a Bachelor's degree. After that, you can prepare for GATE exam which is helpful to attempt for jobs in government and other PSUs.

NIT trichy Uttarakhand is very superb for B.Tech in Electrical engineering and EEE

In my preference, I would suggest Jadavpur University-Faculty of Engineering, Kolkata would be the best B.Tech college in West Bengal for lateral entry.

Technical courses are not allowed by AICTE to pursue through correspondence or distance. Think this yourself, how much of a good engineer will be if he studied from home and has no practical knowledge? So, to answer your question, no.