Since this word is made up of a single kanji, it should use the kun'yomi reading. When learning the kanji, you didn't learn that reading, so here's a mnemonic to help you with this word:
You're part of a special group. It is the cumin group, and they deal with all things cumin (the spice / seed). Smell the cumin. Touch it. Taste it. You live and breathe the stuff, because you are the president of this cumin group.
P.S. This can also be spelled 組み (same overall reading: くみ).
After this, we’ll be splitting into two teams.
Our group is famous around here.
I heard Koichi in grade 3 class 2 was asked out again.