3 Days Left, TPA Headache

Arre, guys, I'm freaking out over here. Exam in 3 days and I still don't get this one thing - what's the difference between servitude and easement in TPA section? I've been going over notes and materials, but every time I try to grasp it, my brain just goes blank. All I see is servitude - wayleaves, profits à prendre, and then easement - right of way, profit à prendre, but what's the actual distinction? Is it just about the duration or something more? I've got cases like Satyanarayana and Srinivasachari, but I just can't piece them together. Guys, please help me out - I'm desperate. Has anyone figured this out?