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.
Nationally, in 2013, the average ACT composite score was 20.9 with a maximum score of 36. The average national scores were 20.2 for English, 20.9 for mathematics, 21.1 for reading and 20.7 for science, with 54 percent of all high school graduates tested.