What INTERVALS should I learn for EAR TRAINING?

Question:I'm doing this exercise where I record a note and then I try to sing the major 3rd. I record a bunch of random notes then try to sing the maj 3rd. My question is: What interval should I work on next? Should I work on the minor third? I know the maj 3rd is important in harmony, but I am still new to that kind of stuff.
Thanks.

Best Answer - Chosen by Asker: I'm doing this exercise where I record a note and then I try to sing the major 3rd. I record a bunch of random notes then try to sing the maj 3rd. My question is: What interval should I work on next? Should I work on the minor third? I know the maj 3rd is important in harmony, but I am still new to that kind of stuff.
Thanks.

The fifth, then the fourth, then major and minor second. In my class, we learned to sing (up) do, me so, then down to me, down to do, as our first exercises.

P5 or P4 Octave then the rest of them!