Hello

Yes, with 180 cut-off marks, you do have a chance to join Tamil Nadu Agricultural University. Getting into the main campus might be tough, but other affiliated colleges are possible.
Your chances improve if you belong to BC, MBC, SC, or ST categories.
TNAU offers many good courses beyond just B.Sc. Agriculture.
Make sure to apply and attend counselling to explore your options.
Don't worry, 180 is a decent score, and you can still build a great future