My tablets volume up and down button is not working .

@yaminrashe84387 either the volume button has dislodged or your have a bad power button/volume flex cable. There are no specific guides for this task. I'd suggest that you start with something like this guide Samsung Galaxy Tab 10.1 Motherboard Replacement and step 7 shows you the flex needed. Here are the Disassembly & Reassembly from Samsung. The replacement flex is available at many online stores.

While you work on your tablet, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has a device with the same issues as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.

Repair is War on Entropy! from Samsung

May be dust between switch or strip complaint. First u try to remove any dust over there with air . Otherwise ur tab needed dismantling and strip changing, if don't u have any idea about it don't try it find near by service shop. That's the better . For emergency case use safety pin or needles to press switch but this cause damage overthere