Lathrop, California. Lathrop is a city located in San Joaquin County, California, United States. At the 2010 census Lathropâs population was 18,023. The city is located in Northern California at the intersection of Interstate 5 and SR 120. Contents.
The lowest composite ACT score possible is 1, while the highest ACT score possible is 36. Other factors will help you determine what a good ACT composite score is for you, and weâll look at those in a minute.
Answer by myluv695 (18). The highest score on the ACT is a 36 in each section (5 sections total). Perfect scores in one or more sections have been achieved for example by students in MO at Mehlville High School. add a comment.