why I take a membership in ieee being a ECE engineering student?

Basically, it totally depends on the individual. It's all upto you that how you use the opportunity. The main advantage of the membership is that you came in contact with the people who are working on different project and you can learn from them. Otherwise, if you are not self willing to learn things, no one can help.

In my opinion, absolutely not required.
What you need to do is focus on building your fundamentals in important subjects such as Network Analysis, Electronic Devices, Electromagnetic Theory, Digital Electronics, Analog Communications.
If you want to build practical skills, work on circuit designing and PCB designing. IEEE level comes much later.