Yes, all candidates are eligible to take the TOEFL tests after clearing 12th since ETS does not mention any academic criteria for any of the tests, i.e. TOEFL iBT nor TOEFL Essentials. However, if you are taking the TOEFL tests, it is important to check individual university-specific admission criteria, which includes the type of English Proficiency test accepted for international student admission or other language requirements.