These three prepositions cause a lot of confusion for English learners. A basic rule to remember is at is used as the most specific, and in is the most general. Look at the examples below and this graph to help you know the differences. https://heathershambles.files.wordpress.com/2014/10/img_4014.jpg
At is used for a specific time or place, such as the hour or a specific address.
On is used for a specific day or date, and for streets.
In is used for weeks, months, and years, as well as countries, states, and cities.
Please leave any questions you have in the comments.
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