Education should be treated as a nominal scale because the years spent between two grades are not same for all the grades. i.e. difference between Jr. College and Sr. College isn't same as between graduation and post-graduation.
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It is ordinal.
Occupation is nominal data. There is not an order to the category occupation, so that eliminates ordinal and interval.
Gender is nominal. Nominal is categorical only; no ordering scheme. Ordinal level of measurement places some order on the data, but the differences between the data can't be determined or are meaningless.
ratio
Age is none of the items listed. Age is ratio data.