The central skill is identifying the criterion behind each figure:
“Knowledge and action are both desirable” — two referents, one judgment: jamʿ.
“Of two generous people, one gives money and the other even risks life” — contrast within a shared label: tafrīq.
“Zayd writes and ʿAmr reads” — expressly assigned actions: taqsīm.
“Face and heart are both fire, one in light and the other in heat” — jamʿ with tafrīq.
“One human population, divided into contrasting groups with different outcomes” — all three combined.
Memorizing labels is less important than explaining commonality, difference, and assignment. The next independent figure is tajrīd.