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DSSSB stands for Delhi Subordinate Services Selection Board.DSSSB is the nodal agency for the selection of teaching and non-teaching posts in state-run mcd schools/ Government Schools. The selection procedure is based on written examination followed by Interview. The DSSSB Application Form is easily available on official website of DSSSB. The application form is only available online and it can be filled through online mode only.
You can also fill online application form in official site: https://dsssbonline.nic.in/
pl find the link
The full for of DSSB is
Delhi Subordinate Services Selection Board