TESU is asking me to take TOEFL

[dfrecore]

Yes, you need to do it, except for citizens of the following countries, Australia, Canada, New Zealand, South Africa, United Kingdom...  Most individuals overseas will require this unless you're from an English speaking country or a country that uses English as an official language, you will need to do the TOEFL.

TESU International Applications Process:  https://www.tesu.edu/admissions/apply-in...al-student
TESU International Student Policies: https://www.tesu.edu/academics/catalog/i...t-policies

If people who have moved from an overseas nation and have immigrated to the US, if they have high school/college done at another country, they have to have high school graduation with college credits and a TOEFL test to verify.  Just follow the two links and you're good.

Will they accept the English 1 course that I took through study.com as a replacement for the TOEFL?

If you look at their website, nothing takes the place of the exam - it's required.