Hi,
The best way is to downgrade to ios 9.2.1. Please check the link given below and follow exactly as it states.
How to Downgrade iOS 9.3 Back to iOS 9.2.1 | OSXDaily
Before you do anything, sync up iPad with iTunes and do a backup, and then download the ios file (the link to download is given inside the article) and save it in your PC/laptop.
It helped me and hope it will help you too.
Best of luck!