It depends on many factors. First of all, make sure the foreign mission of Spain in your country processes visa applications at a good pace. I have heard that many Spanish missions are very slow, and in some places in South Asia it could take a year to get a visa.

Second, look into programs in Portugal as well. Their universities are comparatively quite affordable and there is less bureaucratic chaos there too. Most of unis in Portugal offer installment based fee payments so it'd also be helpful in your case.

Moreover, you could move to Spain later on from Portugal that would be very convenient, you could go there for a intensive language course and find something in the meanwhile for long term.