Now my question is am I eligible for Zakat?
Can we spend the maal on madrasa and other activities of deen, like khidmat of jamat?
Please mention any dua for repay the debt soon.
بسم الله الرحمن الرحيم
You should see your capacity and donate to madrasa and other religious work accordingly.
If you own gold, silver, cash or business item equal to nisab (value of 613 gram silver), then you will have to pay zakah of the total value which you own after completing one (lunar) year. But the debt which you have taken for business, its instalments of this year will be deducted from the existing value and the zakah will be calculated.
See the below link for dua to repay the debt soon:
Allah knows Best!
Darul Uloom Deoband