the Covid test is only nasal via, there are PcR and Antigen test, other test are not effective, the blood test is only used if you already had the ill, I will recommend you Salud Digna, the antigen test is the less painful
Is Farmacias de Ahorro in GDL and PV? Last month in CDMX I went to them for an antigen test (345 mxn) in order to travel home to the states. In and out under 30 min and great experience overall. Don't forget to tip the doctor also
In general in MX just google in Spanish, translate apps are just fine. Spanish is the language here so just deal with the translating online and you will be fine.