Hi guys. I planned to setup a test CentOS server for my personal use.please recommend hardware requirements!?

That depends very much on what you want to serve.
Me, I serve a simple blog to the world and media files (no transcoding) to myself.
The computer is a single-core, 2GB RAM, 11-year-old laptop, the hard drive is newer and has 1TB.
It is more than sufficient.

So, what do you want to serve?

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I experiment with Centos 7 on virtual machines with a single virtual CPU, 2GB RAM and roughly 50GB storage, most of which is unused.

For personal use, I have an always-on server the size of a credit card, an ARM CPU, 1GB of RAM and a 32GB SD-Card as storage. It runs Ubuntu Xenial, not Centos. I use it as a Samba server for backups on an external 3TB disk. It also hosts my DNS and DHCP.

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If you look at CentOS docs site, you will find this page that lists max/min requirements:
https://wiki.centos.org/About/Product

Then, as others have mentioned you will need to tweak this for your needs.

For example, you would not purchase a 2-seat convertible for family of 4? Or perhaps a Hybrid car to haul a 30K lbs trailer.

Only you can determine what this machine will be used for...

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You also wouldn't purchase a BMW family van if you only ever drive alone?
Or a Ferrari if you only travel within city limits?

(Ok, Ok, I know, many people are doing exactly that - both literally, and translated to computers)

#vanlife

Even alone, a van you could setup as a mobile home / camper. While MOST probably wouldn't, there's no reason not to if it's in your budget and desires.

I kind of wanted to take a more sarcastic approach. A computer with RAM that can boot linux. I setup CentOS on an athlon x2 with 1GB RAM, but probably a decade ago. Making it a desktop distro was a bit more work, but possible. They're all for the most part "linux" and can be augmented with extra bits via the packaging system or more manual methods. I tend more towards debian given a choice. But I can muddle my way through most distros. Although in my case, figure out how to do it on debian first. Then figure out the Distro X's way to do the same thing. But only because debian annoys me the least (sane defaults / package availability). And I am most familiar with it's packaging system.

I think we are getting off the subject a bit.

Based on my own experience, I would recommend the following.

4GB RAM should be adequate for regular home computing. If you want to run virtual machines, add 4GB RAM for each VM you expect to run simultaneously.