For national scholarships/grants:
For 2020 the windows to apply have been extended:
Educational assistance: until the 30th of September❗
Non University Education: until the 1st of October❗
University Education: until the 15th of October❗
Every Autonomous Region also has their own scholarship system, if you google ´becas educación´ followed by the name of your region, they will come up.
Some are income-related or have a fixed part for all students, and a variable part that depends on income family unit or grades of the student.