I am practicing singing and trying to achieve the notes .I am using garage band , trying to hit the c3 note(vocal training). Is there any way to check the frequency of my "vocal pitch" in garage band.
What you're looking for is a tuner. They will tell you how close to the pitch you are.
Google tells me that GarageBand has a tuner. I do not have a Mac, so I can't verify this.
Finally, you could always use a good old hardware tuner. Available from your friendly local music store (or the interwebs) for a few tens of dollars.
Had the same problem a while back.
You can install an app if you are using a mac or iphone that can return your pitch. They are surprisingly accurate for what they are.
Here's a blog about the subject.