Learning ranks are a way to measure and reward engagement on PreprLabs. You can increase your learning rank by gaining learning points.
To see how many learning points you need to move up a rank, start by clicking the Grid Menu in the Top Navigation Bar, then selecting Achievements. This will take you to the Achievements page.
Here, the meter at the top of the page will tell you how many learning points you need to earn in order to increase your learning rank.