I did this a year ago. When they came to Chapala, the test was in Spanish and everyone was required to do a parallel parking test. When I went to Guadalajara with Luzma, the test was in poorly google translated English. It involved identifying the meaning of traffic signs. There was no driving test required if you could show a driving license from anywhere. (One person's was expired and that didn't matter). I don't remember what the cost was but Luzma was able to get the cost I paid in Chapala discounted because I was over 60.