Question: asking about  preparation of  nske  solution
Answer: material required
for preparation of 100 liters of 5% nske solution, following material are required

neem seed kernels (well dried) – 5 kg
water (reasonably good quality) – 100 litres
detergent - 200 g
muslin cloth for filtering
methodology
take required quantity of neem seed kernel (5 kg )
grind the kernels gently to powder it
soak it overnight in 10 liter of water.
stir with wooden plank in the morning till solution becomes milky white
filter through double layer of muslin cloth and make the volume to 100 liter
add 1% detergent (make a paste of the detergent and then mix it in the spray solution)
mix the spray solution well and use