- I have paper of class 9th cbse

SIr can u pls help me by telling the questions which are repeated every year
Dear Sir,
Suppose we are a Manufacturer and exporter, if we purchased a consumable goods from unregistered party, so how we maintain their accounts and if we wants to take a Input Vat Refund?
purchased 5 pcs computer @ 25000 from furniture world 3 pcs for office , 2 pcs for personal in tally