Will you please tell me how to get placed in good companies for electrical and electronics department???

Well to get placed in good companies for electrical and electronics department, you must secure 60 % throughout your career that is you must have minimum 60 % in 10, 12 and B.Tech. You should not have any pending backlog even though you have secured an aggregate of 60%. So I will suggest you to finish of your backlog by the completion of your B.Tech and try to see that your aggregate percentage in B.Tech will not be below 60%. Appear for the recruitment drives of your Core companies

You just need to try it and be prepared for MNC interviews keeping concentration and practice on the following;

Self Introduction round
Group Discussion round
Aptitude test
Trade or Software test round
HR round interview
Pre-process training and so on

Electrical or Electronics Companies in India

Holoflex Limited

The Videocon Group

Bharat Electronics Limited (BEL)

Hightension Electrical

Electronics Corporation of India Limited (ECIL)

O.E.N India

Aar em Electronics

Semiconductor Complex Limited (SCL)

Supertron Electronics

Andhra Electronics