hi,

government polytechnic , thane is a prestigious college to pursue diploma courses. if you are a 10th pass candidates from a recognized board, you may get admission based on your 10th score, so first of all you need to apply for the diploma admission in DTE  (directorate of technical education), maharastra website. if you are 10+2 pass out you may directly apply for diploma course from second year. follow the below link to know in details,

https://poly19.dtemaharashtra.org/diploma19/admin/uploads/update_rules201905171408137708.pdf