BITSAT fees

likha hai ki session 1 ka 3500 hai aur dono ek saath karoge toh 5500 hai lekin ye bhi likha hai ki session 1 ka registration karlo fir exam ke baad bhi session 2 ke liye register kar skte ho lekin jab session 2 ka alag se karenge toh fees 3500 hogi ya 2000?

likha hai ki session 1 ka 3500 hai aur dono ek saath karoge toh 5500 hai lekin ye bhi likha hai ki session 1 ka registration karlo fir exam ke baad bhi session 2 ke liye register kar skte ho lekin jab session 2 ka alag se karenge toh fees 3500 hogi ya 2000?