Well Congratulations on your excellent job in GMAT. My advice to you on career path would definitely be nil until we know what's your post MBA plan.
Usually, business school placements are generally categorized into two processes:
Structured Process
There are few companies (Amazon, JPMorgan etc to name a few) that provide opportunities for MBA graduates irrespective of nationality; The jobs through this route are usually modeled as rotational leadership development programs. Start-up companies hire candidates from top tier schools through the school’s career services. Approximately 1 out of 4 MBA candidates are usually placed through the structured recruitment process.
Application-based process
Companies without a proper recruiting process with schools will visit the campus for promoting their business and showcasing career opportunities in their companies. The company representative will address any queries and invite candidates for applying to open positions.