It is good to think about appearing in engineering exams by living in Abu Dhabi as opportunities for UG courses are very less. Most of the students studying in Abudhabi return to India in order to attend Engineering and Medical colleges after their class 12th.
Please check IIT JEE form and applications in Abudhabi.
You can keep your centre in Indian counsulate in Dubai or Riyadh in KSA.
All the best!.