If your mobile is showing high RAM usage (more than 80 percent ) each and every time then I am going to tell you something by which you can minimize the RAM usage of your Android Mobile. High RAM usage leads to the higher consumption of Battery so you can also increase your Battery backup at some extents.
I faced the problem of high RAM usage on my mobile and did many things and some of things succeeded. Which might help you as explained below
Go to setting > Apps > Manage Applications and uninstall the programs which you don't use or most rarely use. This will reduce the burden.