Well, to summarize eligibility , i must say that Knowing synonyms or adequate vocabulary , clarity in writing concepts, flawless Grammar , fluent speech and identification of keywords in a written passage, tenses, error free sentence structures are first step to IELTS. Once a candidate is through with it , it needs to LEVEL UP consistently by listening , reading writing and speaking . Regular practice and consistent scores in class marks up your eligibility to enter into IELTS .