Hello! 

The colleges or universities which offer astrophysicist courses are - 

Suffolk university - bs in astrophysics concentration

Texas tech university - bs in physics astrophysics concentration

University of Wyoming - bs in astronomy and astrophysics

George Washington University - bs in astronomy and astrophysics 

Arizona State University - bs in Earth and space exploration astrophysics 

University of cincinnati - bs in science astrophysics

The basic tests which are required to study in the USA for bachelors are - 

SAT's and the English language tests include - TOEFL and IELTS for USA and Canada.

Wish you all the best.