If you want to save USD4,000 (QR15,000) from a salary of 40,000 that means you can spend only QR25,000/month. If you take away 12,000 for rent and 8,000 average for schools then the remaining is QR5,000 only to spend every month.
If you want to live decently in a compound with kids going to ASD, then QR5,000/month is definitely not enough to cover all other expenses including phone,internet, power, water, groceries, clothes, eating out, gifts, other kids expenses, a maid (is almost a must for a working lady wtih two school kids), travel (once or twice a year), transportaion.
The other question you can ask yourself is weather your job really deserves a payment of more than QR40,000/month or not.
We are a family of 4 living in a compound villa and have 2 school kids and our average monthly spending is in excess of QR40,000/month