I have actually been looking into acquiring the EA designation myself. I worked as a software engineer and recently FIREd, but last year I started volunteering with the
VITA program preparing tax returns for lower-income neighbors. That was a rewarding experience and I intend to do it again next year, and probably for several years into the future. While I know quite a bit about the areas of tax law that apply to my personal financial situation, there were several folks who came into our site last year with questions I couldn't answer. For that reason I thought it might be helpful to learn more about tax law and maybe get a credential to prove that knowledge.
The enrolled agent designation seems like a pretty ideal outlet for that because there's no particular education requirement. You don't need to take a particular course of study to qualify; anyone can take the exam, how you decide to learn the material is up to you, and once you pass you have the same credential as anyone else. Once you are an EA, you have the same rights to represent clients before the IRS as a CPA or an attorney does. Pretty nice for a designation that you can theoretically get at age 18 with just a high school diploma and a bit of extra study!
As to your questions,
1- Is there any scope of EA?
I'm not sure what you mean. Can you rephrase the question?
2- if yes, then do i have to join any institute or i have to do self study?
There may be formal classes to earn this designation, depending on where you live. Self study is always an option.
3- if i’m going for self study option where to find study material?
I have found
this series of study books to be useful. There's a separate book for each of the three parts on the exam. Part 2 (business taxes) is widely considered to be the most difficult section, and is where I'm focusing the bulk of my study effort. Since you're from Pakistan and probably have little prior experience with filing US tax paperwork as an individual, you may need to devote a good deal of study to all three sections.
4-is it worthy if i join h&r block to practice laws? Do they provide internships?
Be careful..."practicing law" has a particular meaning here in the US, and you probably don't want to claim that you do that without first becoming a member of the legal profession! H&R Block does hire quite a lot of people with no prior experience, and they offer a tax course meant to teach people enough to be useful employees at their firm. I don't think this course is necessarily designed to prepare you to sit the EA exam, but it might be a useful first step.