The new IB syllabus has given this topic a boost! There is some good biology here now, as well as a twist in the end for HL, about speciation.
TOPIC 5 EVOLUTION AND BIODIVERSITY (and classification). The syllabuses:
10.3 (HL) GENE POOLS AND SPECIATION
The SAT syllabus is a tough call! Maybe 15% of the biology exam covers this topic: EVOLUTION AND DIVERSITY. There is a huge amount to remember! Learning and remembering the major groups of animals and plants, and their identifying features is quite some task. Here are SparkNotes:
(Evolution and the formation of new species): species, speciation, evolution