Is there a driver for Windows 10 for ASUS T300L as the Windows 8 version is not working right?
Yes, there are drivers for Windows 10, but you need to make sure that the installed version of Windows is 64bit. I have checked the drivers page and there are drivers created for Windows 10 64bit.
Download page: https://www.asus.com/2-in-1-PCs/ASUS_Transformer_Book_T300LA/HelpDesk_Download/
I also recommend removing any previous drivers that you've tried to install to avoid conflicts with other components.