CREATE TABLE table_12148147_2 (third_year VARCHAR, first_year VARCHAR)

How many classes are taken in the third year when pag-unawa was taken in the first year?
SELECT COUNT(third_year) FROM table_12148147_2 WHERE first_year = "Pag-unawa"
SELECT COUNT("third_year") FROM "table_12148147_2" WHERE "Pag-unawa" = "first_year"