How to set all flags in 8085?
The five flags on the 8080/8085 are Sign, Zero, Carry, Half-carry and Parity. It looks like your program clears all of them. The result of the ANI is not zero, not negative and has odd parity. Also, logical operations like ANI unconditionally clear both carry flags.

Actually, the most direct way to set all of them is something like this:

LXI H, 0FFFFh
PUSH H
POP PSW


Which your teacher may or may not consider a "cheat". (Actually, I can't think of any other way to get both the Z and S flags set simultaneously.)

I'm amazed that anyone is still teaching this ancient architecture, rather than something that's actually still in production. It's utterly useless knowledge.