Very few people complete the full JAA "Frozen ATPL" in a year. Even the full time integrated courses take a little over a year. Modular will take longer than integrated and unless the SA school is well geared up for JAA stuff it's just another potential hurdle which could make it take longer.
Here's some graphs on ground school pass rates:
FTE Jerez: Ground School Results
Self study this will take 6 months to a year. I'm sure other people have done it in less, but this is a guideline figure. If you go to a residential course you could do it in 3 months (maybe). Alternatively you could just learn all the questions in about 2 months!