Add Skip
before Take
in your (inner) for loop.
int newJobCount = JobCount / 4;
for (int i = 0; i < 4; i++)
{
Test(item.Value.BrandName, item.Value.CountryCode, item.Value.Jobs.Values.Skip(newJobCount * i).Take(newJobCount).ToList());
}
Side note regarding newJobCount
If you want to limit number of jobs per page to 3000, then following will be better:
int pageCount = JobCount/3000 + (JobCount % 3000 == 0 ? 0 : 1);
for (int i = 0; i < pageCount; i++)
{
Test(item.Value.BrandName, item.Value.CountryCode, item.Value.Jobs.Values.Skip(3000 * i).Take(3000).ToList());
}