I has ipad 3 generation and can not update further than ios 9.3.6

iPad2, iPad3 or original iPad mini cannot be updated beyond iOS 9.3.5 (WiFi Only models) or iOS 9.3.6 (WiFi & Cellular).

Apple ended update support for these devices in September 2016. None of these models can be updated to iOS 10 or later versions, as the internal hardware does not meet the minimum technical requirements for new versions of iOS/iPadOS. These are all 32-bit devices, this system architecture being effectively obsolete.

Many App Developers have also dropped support for older devices and iOS versions preceding iOS12/13 - and have withdrawn older versions of their Apps from the Apple App Store.

If Apps that you need to use now have higher minimum iOS-version requirements, your only option is to replace your iPad with newer model. Even the basic current iPad model supports current iPadOS 13.x - and has hardware specifications that will vastly outperform your old iPad

I hope this information is helpful - if only in clearly stating your current options.

Your iPad is too old and cannot be upgraded any farther.

These old 8 and 9-year old iPad models will very soon be completely obsolete by the end of 2020!

Here's why and what you will need to do about it in 2020!

Tap and read my links below for my additional info about your old iPad model.

"Sudden App Death” for Completely Res… - Apple Community

If you own OLD 8 and 9 Year Old iPad mo… - Apple Community

Time for a new, new refurbished or much, MUCH “newer”, used iPad model, now.

Sorry & Best of Luck to You!