The International Olympiad of English Language is an exam which is known for its competence and knowledge in the subject of English Language. It is held every year at the National and International standards, and is based on the syllabus as mentioned by CBSE/ICSE and the other State Boards. We would prefer you to refer to the books published by SilverZone for a good preparation of IOEL.
For more information like Syllabus, Marking Scheme, Sample Papers & Preparation Materials, Click here.