Does having 3 doses of tetanus vaccine make you fully immunized or is it still partially immunized? (one vaccine as a baby, one at 12, and one at 2 weeks ago). and the 2nd and 3rd dose is an anti tetanus in the philippines (one that lasts 1/2+ years?

The Philippines is a big country, and big countries may have different vaccine schedules for different states or provinces. The type of tetanus vaccine, and the timing of one's past doses, make a big difference. So, nobody but your doctor knows the exact answer. In general, a 16 year-old who got his third dose 2 weeks ago is fine today, but should check locally to see when his next dose is due.