If you can organize a new Ed visa before you leave, take the paperwork with you when you go out, then fly to Laos / Malaysia when you come back, get the new Ed visa, and come in with it via land border, then no chance of getting denied. Ask your school if you can do another year.
Often you need to get some document from immigration to say you've finished your current ed visa, before you leave, if you intend to come back in on visa exempt. I found this out when I got pulled aside at the Burma land border, they pointed out my ed visa was over and asked where my documents were to say I'd finished that course of study. I didn't have it, eventually they let me in with visa exempt but it was a close call. If it was at an airport they probably wouldn't have been as relaxed, and denied entry. So ask your school if you need to get that document.
If you're renewing to go onto another Ed visa, you don't need to get that document, my school said. So that's another benefit to trying to organize a new Ed visa before you leave. If it's not possible another option is to renew your passport when you go back home, then you can restart the process, 3 more years of Ed visas.