Many of us have multiple Google account for different projects. You may have personal Gmail id, a special id for websites, and another for public forum. Once again Google has the solution for you to use multiple accounts.
Add Multiple Sign-in to your Google account.
When you login to a Google service like google search , docs, or G-mail, you’ll see a gmail address tab at the top right .
First login with ur primary account, since this will be ur default account page, at any of the above page.
Click on the settings tab> google account settings or in some case My account you will be forwarded to the profile page of your account. There you’ll find multiple login tab,
click on it and you’ll find this page.
Click on all radio button and click save
Now you will see a down arrow on the e-mail id tab click on it and sign in with ur secondary google account.
Have a look: