Here are a few of the most popular exams:
Cambridge:
Key English Test (KET). This basic-level qualification is a proof of your ability to use Engish to communicate in simple situations.
Preliminary English Test (PET). This qualification shows that you have mastered the basics of English and now have practical language skills for everyday use.
First Certificate in English (FCE). Cambridge most popular qualification that proves you have the language to live and work independently in a English-speaking country or study on courses taught in English.
Cambridge English Advance (CEA). This high-level qualification shows you have the language skills that employers and universities are looking for.
Cambridge of Proficiency in English (CPE). Cambridge highest-level qualification. It shows that you have mastered English to an exceptional level and that you can communicate with the fluency and sophistication of a highly competent English speaker.
Business English Certificate (BEC). These are a suite of three English language qualifications for international business. They show that you can use English confidently in international business environments.
International English Language Testing System (IELTS). IELTS is the world's most popular test for higher education and global migration.
TOEFL:
Test of English as a Foreign Language (TOEFL). It is a test of English language proficiency for non-native English language speakers wishing to enroll in US universities. The test is accepted by many English-speaking academic and professional institutions. TOEFL is one of the two major English-language tests in the world.
NOTE: Certifications are not issued here. Once the students gets the right preparation, they will be able to take the exams and receive their certifications from an authorized institution.