Windows 10 is a memory hog and I guess most windows users would agree. I was in a dilemma if LTSB is better at some point. After some experimenting and creating my customized Windows 10 Pro version by removing unnecessary stuff, I was able to get it running under 850Mb RAM!
This version also has telemetry,cortana,defender and other metro app crap removed by default. :)
I have written a tutorial if anyone's interested. He is the Link:
https://www.technograte.com/windows-10-1gb-ram-tutorial/