I think you can apply for TPS EAD anytime. Instead of that these days colleges and University are making exceptions to students from Nepal who were here during the earthquake time allowing them to enroll for 6 credits for Undergraduate and 3 credits for Masters. I heard that students can also apply for financial hardship EAD. Instead of TPS EAD which i heard if you work under than your status will be void and all that, why not financial hardship bhanera EAD and work full time. If you have 20 hours of work in school talk with your DSO to allow work more hours within school as well.