German Visa application

Here's the full rules:

The mission must ensure that the following requirements have been met in each individual case:

1. The purpose of the trip to Germany must be plausible and comprehensible.
2. The applicant must be in a position to finance his/her living and travel costs from his/her own funds or income.
3. The visa holder must be prepared to leave the Schengen area before the visa expires.
4. Documentary evidence must be provided of travel health insurance with a minimum coverage of 30,000 euro valid for the entire Schengen area.

Should an applicant be unable to prove that he/she can finance the journey and stay from his/her own funds, a third person may undertake to cover all costs associated with the trip in accordance with sections 66 and 68 of the Residence Act.

For 1, a written invitation from your boyfriend and proof of his residency status should be sufficient. I'll assume that 2 and 4 are straightforward as well. That leaves 3 as the main hurdle. According to this website, embassies will typically require proof of family ties and sufficient income.

The best option I can think of would be to already secure a job (i.e. employment contract) for the time after your return from Germany.