Hi,
The peruvian test bank is a FAA test bank, just translated into spanish, rather poorly I must say. This sometimes can be a bit confusing when doing the exam! The CPL theory is the same as the US one, but the ATP has 100 questions and includes both 121 and 135 test banks! You will have to take both writtens, CPL to convert and ATP to legaly fly in an airline in Peru.
Also take the ICAO English Proficiency exam while at the DGAC (written test and oral evaluation), level 6 should not be a problem for you!
Good luck!
OW