Bangalore and chennai has a lot of companies working in embedded.
If u are a fresher sharpen your C programming skills by going through the book 'Test your C skills' by yeswanth kanitkar. Try to understand basic functionality of RTOS. For this u can refer any OS book or the book given below.
"An embedded software primer" by david E simon.
Then finally a bit of hardware knowledge about serial buses like CAN, USB, SPI, I2C etc.
I hope i have answered you . please let me know for any other clarifications.