Here are some fun and creative exercises that you could use with your students to help them develop competence with BODMAS.
Use exactly two twos (2) and any BODMAS operations to make as many different numerals as possible.
Only four different answers are possible and BODMAS did not have to be used because there were no multiple operations.
Use exactly three threes (3) and BODMAS operations to make as many numerals as possible.
As powers or indices are not part of BODMAS and the latter expression is probably beyond the mathematical knowledge of many junior high school students, they are not included here.