Hi,
After pursuing bsc in agriculture you can pursue msc in agriculture from different subjects like -
Agronomy
Horticulture
Agriculture economics
Soil science
Agriculture communication
Forestry
Dairy science
Plant pathology
Entomology
Vegetable science
Genetics and plant breeding
Meterology
So choose the one which you like the most and try to clear an entrance exam so that you can get the top college
Hope it helps.