I am currently (2017-2018) in class 11 and am planning for MIT. Which year SAT exam should i prefer?

Hi Gargee

SAT 2017 analyses a candidate's ability in four sections - Evidence-Based Reading and Writing, Reading Test, Writing and Language Test and Math. Subject Tests are hour-long, content-based exams that assess a candidate's strength in specific subjects. Unlike the SAT test, some colleges require or recommend that you take SAT Subject Tests. The SAT 2017 is offered seven times each year in the US and six times internationally.
Read https://studyabroad.careers360.com/sat-test?icn=sat_article&ici=sat_exam_rdmrvp to know more about SAT.

MIT applications are available online in August of the year prior to proposed entry. Early Action has a November 1 deadline. Regular Action candidates should complete the application process by January 1 of the year of intended entrance. Early Action decisions will be announced in mid-December.

To be considered for Early action, take the tests before November. ie to be considered for admissions in 2019 January, you should take the tests before November 2018.

All the best.