Five months is enough if the time is targeted, not just filled.
Most Cambridge 0580 students can make meaningful progress in five months. The mistake is using all five months on broad revision. A better plan is one month to diagnose, one to repair the weakest areas, then three months of structured past-paper work with exam method built in. This protects the highest-mark areas instead of spreading effort thinly across topics that are already secure.
The plan below assumes the student attends school and has roughly one tuition class plus three to five hours of independent practice per week. It can be compressed or stretched depending on the starting point.

