If you are plenning for IIT JEE i would recommend you to consider other engineering examinations as well but, that will completely depends on you.
Other options available are AIEEE/ IISER/ SAT test etc. For more info on these examinations you can visit askIITians NRI coaching.
Specifically you can find all the details of IIT JEE on IIT JEE form and applicetion in Sharjah.
IIT - Mumbai