Polytechnic

No, it doesn't. Courses offered by this institute are mentioned on this link https://www.shiksha.com/college/wisdom-school-of-management-darya-ganj-darya-ganj-delhi-35124/courses?ct[]=74&lo[]=773

According to me, you have to read that subject (That you applied for Diploma) from class 9th to 12th. You will get good marks in your exam.

Check out the official link below for details:
http://www.pcpolytechnic.com/admission-procedure.html
http://www.pcpolytechnic.com/admission-process.html

King India's Book will help you clear Polytechnic and entrance exam also. My preference is to read NCERT books.

Hello Adarsh Upadhyay, Polytechnic is a term that is normally reserved for a college or an institution which imparts training for teaching to students who have taken admission for becoming Diploma holders in engineering. Now a days many state governments conduct an entrance exam for screening students who have passed 10th examination for giving admission based on merit in this entrance exam which is sometimes called as Polytechnic entrance exam. Best wishes to you.

Admission is through Centralized Admission Process of Maharashtra based on marks obtained in class 10th, there is some percentage of All India Quota for admission apart from state quota, you can get admission through it.

Yes, you can join B.Tech electrical engineering after polytechnic/Diploma, but the admission will be through WBJEE.

Check out the detailed eligibility below:
https://www.shiksha.com/university/vignan-university/vsat-exam.

I think, yes, you are eligible for B.Tech. But for further details, you can contact the university directly or you can find the details here:
amity.edu

No, Diploma or Polytechnic isn't equivalent to an associate degree. It is equivalent to intermediate.