Ang application ng student visa dependent dapat may one year pa remaining validity otherwise, hinde na ma-grant ang visa. so if mag expire ng aug 2018, dapat before aug. 2017 naka-lodge na application sa embassy or online. I'm not sure kung paano process ng post study visa or graduate visa( visa options for students who finished their studies) dependents. I suggest you use an agent for the application. Kase kung newly weds mas mahirap mag-bigay ng documents or to prove yung established relationship. meron kaseng na-denied na dependendent visa kase hindi ma-established yung relationship-- like no joint account, properties with both their names on it ,etc.
So try an agent, yung accredited or MARA- registered. may option din na defacto(fiancee) visa, pero need mo submit mo mga proof na matagal na kayong bf/gf, mga pictures to prove yung relationship. try looking sa forum yung mga newly married applying dependendents visa