Use maximal capitals for the full titles of school and tertiary subjects:
English as a Second Language Mathematics I Modern History Psychology 101
But the names of curriculum areas do not carry capitals:
English, mathematics, natural science and physical education are compulsory subjects in Australian high schools.
She is interested in history.
Similarly, use capitals for full formal titles of tertiary degrees and TAFE courses:
Bachelor of Applied Science Master of Social Science Doctor of Philosophy Certificate III in Community Services Diploma of Early Childhood Education and Care
But nonspecific references to courses have no capitals:
She completed a masters in science.
The basic level required is certificate IV.
He received a doctorate.