Hello there,

GRE subjects test syllabus is as follows:

BIOLOGY

• Cellular and Molecular Biology 
• Organismal Biology
• Ecology and Evolution

CHEMISTRY

• Analytical Chemistry
• Inorganic Chemistry
• Organic Chemistry
• Physical Chemistry

LITERATURE IN ENGLISH

• Literary Analysis
• Identification
• Cultural and Historical Contexts
• History and Theory of Literary Criticism Calculus

MATHEMATICS

• Algebra
• Discrete Mathematics
• Real Analysis
• Probability and Statistics
• Additional Mathematics

PHYSICS

• Classical Mechanics
• Electromagnetism
• Optics and Wave Phenomena
• Thermodyamics and Statistical Mechanics
• Quantum Mechanics
• Atomic Physics
• Special Relativity
• Laboratory Methods
• Specialised Topics like Nuclear and Particle Physics etc

PSYCHOLOGY

• Biological
• Cognitive
• Social
• Developmental
• Clinical
• Measurement/Methodology/Other

Hope this helps.