Hi @manojg28146
Due to hardware limitations in the tablet (it's old, released in 2013), the best that you can officially do is to upgrade the tablet to [https://www.sammobile.com/samsung/galaxy-note-101/firmware/#SM-P600|Android Ver.5.1.1] and hope that there are apps that will still work with it.
As for installing a custom rom, try searching on the ''xda developers'' website as they seem to be more into that kind of thing.