State and critically explain any three alternative programmes rather than universities public get and apprenticeship that can be explored after grade12

Well you can enroll in a vocational school where you can learn skills like machine operation or electronics. You can also apply for an on-the-job training program where you can get certification while earning income.  At the very least, you can attend workshops that give training certificates to attest that you have to learn such skills for the job you will apply for.