GST inplications on charitable trust

we run a charitable trust in which we provide rooms to the pilgrims and the rent of the rooms start from 700 for 2 beded room to 2500 for a 8 beded room
our total revenue per annum from rent crosses 30 lakhs in which 80 percent or approx 24 lakhs are received by revenue of 2 beded rooms and rest from the others
the trust dosen't have any other income source

my question is

1.Are charitable trust are exempted from GST

2.room rent below 1000 per day are exempeted from GST, Is it true

3.if it is true, can we calculate the revenue received from this rooms below 1000 per day which amounts to 80% of total revenue as exempt and revenue above 1000 per day diffrent which is below the exemption limit of 20 lakhs

Awaiting the reply

Thanks in Advance