hello im presently doing my B.tech 3rd yr in electronics and communication and i would finish my course in 2014 when can i write toefl exam

Although, TOEFL score can be utilised in 3 years, there is no hurry to give it now as GRE score required for MS has to be current. Secondly, during the admission process, you are required to submit all your mark sheets till final semester hence, complete your degree first then appear for GRE and TOE