Hello Carla,

Your permanent residence card is totally valid and it seems you do meet the requirements to apply for the Spanish nationality after 10 years´s residency in Spain, in September. Absences due to educational matters are not considered in a negative way when considering your degree of integration in Spain.

Regarding your last question, be informed that those facts are complementary and not compulsory when proving your integration and actual residency in Spain. There are different ways to prove the 10 years effective residency other than the registration at the Social Security system and tax declarations.

Regards,