There are several tests that you can take to demonstrate your proficiency in English. Some of the most commonly used tests include:

1. The Test of English as a Foreign Language (TOEFL): This test is widely accepted by colleges and universities in the USA as a measure of English language proficiency. The TOEFL is offered in both an internet-based format (iBT) and a paper-based format (PBT).

   

2. The International English Language Testing System (IELTS): The IELTS test is designed to assess the language abilities of people who want to study or work in an English-speaking environment. It is offered in both an academic version and a general training version.

3. The Cambridge English Advanced (CAE) test: This test is designed for people who need to use English for academic or professional purposes. It is accepted by many universities and employers as evidence of a high level of proficiency in English.

4. The Pearson Test of English (PTE): This test is designed to assess the English language skills of people who want to study or work in an English-speaking country. It is accepted by many universities and employers as evidence of English language proficiency.

It's important to note that each test has its own set of requirements and may be more or less suitable for your needs, depending on your goals and the institution or organization you are applying to. It's a good idea to research the requirements and format of each test carefully to determine which one is the best fit for you.