Technical secondary school diploma is of low value.

Studying in the banking school organized by your provincial branch is actually a kind of pre-job vocational training. Then you can get the secondary school diploma. Now the secondary school diploma is as easy to get as the high school diploma, and its value is sometimes not as good as the high school diploma. Synchronous junior college means that you can pay for adult correspondence or self-study junior college at the same time, which is qualitatively different from your current junior college diploma!

Dispatch labor

Please note that the nature of employment is "dispatched workers", not contract workers, and it is clearly stated that temporary workers are not formal workers. This is an old trick that your provincial branch is still playing. Our postal savings bank openly recruits workers for the society, and the diploma requires at least full-time college degree or above. Your province is still engaged in consanguineous marriage to solve some livelihood for those useless children!

Junior college is better.

I suggest you leave it alone and continue to study in your junior college. It is better to be promoted to a junior college. When you graduate, you will participate in the campus recruitment of the branch or head office in your province. Then you will be a regular contract worker and a full-time college student, eight generations better than that!