Can I complete an eighteen-month course in one year by completing assignments and tests early and then apply for a job for a Master's?

No, you generally cannot complete an 18-month master's program in one year by finishing assignments and exams early. U.S. universities and student visa rules require you to follow the official program duration and academic calendar.

Finishing early could risk your student visa status and eligibility for post-study work options like OPT (Optional Practical Training). If you’re interested in shorter programs, some universities offer accelerated master's tracks, but these have specific entry requirements and structures.