Why you would be trying to pass a test on the IBM 360 series I don't know - they had about as much processing power as my watch does, and they stopped making them in the '70s or early '80s...
However, it's your test, so you should learn it for yourself, rather than just getting spoon fed:
http://en.wikibooks.org/wiki/360_Assembly/360_Instructions[
^]
Or:
http://www.bixoft.nl/english/oplist.htm[
^]
For example, the second site will tell you that BALR is basically a subroutine call, and give you a full explanation.