You must request the equivalence of the courses you passed in your own education system as being equivalent to the Spanish Título de Bachillerato.
It consists in the calculation of a maximum rating of 10 points with which the students may participate in the Spanish university admissions procedure. This calculation is made with the results obtained from exams or academic transcripts in your education system of origin.
The management service for access and admissions of students to Spanish universities is called UNEDasiss.