As you want to get the Assistant Station Master syllabus of Railway exams so here is the information of the same for you:

General English:
Questions on General English are designed to test the candidate's correct usage of prepositions, words and phrases.

Mathematics:
Questions on Mathematics are designed to test accuracy in rapidity in working. These will mostly be questions in Arithmetic.

General Knowledge:
Candidates are expected to possess a broad knowledge of current events and matters of general interest, particularly relating to India, including Indian Railways.

General Intelligence:
The questions are designed to test the candidate's power of reasoning and his ability to draw conclusions.