I don't have experience working in Aspire but most companies really do that. The offer in the letter is lower from the amount agreed during the interview.

To give you some insights for your daughter's allowance.

There are 3 Filipino schools here.

Since your company will pay for your daughter's education you will be exempted from;

School Fee (Filipino School)
Tuition (Monthly) 400-700QR (depending on the grade level)
Bus Fee (Monthly) 400-500QR
Miscellaneous Fee 1500-2000 QR (whole year)
For Internation School ( it might be doubled or tripled)

other expenses

My daughter is in grade 4 and I allot;

300 QR (Monthly school allowance for snacks, projects and other school requirements)
400 QR (Monthly Food Allowance)