yes! if your age is above 16 you can easily attend the exam also, but its not that easy to clear it. But it's good to start preparing from 11th, You can try it after your 12th.... if you really want to clear it for your 1st attempt, go for a good ielts online coaching for random preparation, for more details visit ieltsonlinecoaching (https://ieltsonlinecoaching.in/) .