Implementation of AB 705 in fall 2019 required California community colleges to use high school grade point average (HSGPA) as the main measure of placement and maximize the likelihood of students being placed into transfer-level English and math courses. Since that time, research has shown that with the vast increase in access to transfer-level courses, the one-year completion rate of these courses (i.e., throughput) also increased. These completion outcomes exceeded prior throughput rates when students largely began in basic skills coursework. However, as throughput increased for all student groups, course success rates decreased at varying rates across colleges, causing some concern about the validity of high school transcript data as a predictor of success in transfer-level English and math courses. To further explore this issue, The RP Group's Multiple Measures Assessment Project (MMAP) research team examined the validity of HSGPA in predicting course grades in students' first community college course in either English or math when that course was at transfer level. The following brief reviews the methodology and highlights key findings and conclusions. Graphical displays of the results are included in the brief, while the full results of each model are included in the appendix. As this summary demonstrates, strong evidence continues to support HSGPA as a valid measure for community college placement into transfer-level English and math.