As a school teacher working with A level, I do not give four stars about what universities expect, need or want it?s about what my school expects. My grade predictions are based on what I think a student can realistically achieve and leave me in a reasonable and defendable position. I cannot speak for all schools but most of those I have worked in require me to explain when a student fails to reach their predicted grade. I am usually allowed some leeway around one grade either way.
My thinking has to go as follows:
If I have a student on AS with a grade A, it is possible they will get an A at A2, or they may get an A* or it is possible that they could fall to a B. That?s reality. Such a student is very unlikely to drop as low as a C.
If I predict an A* and they get an A, all is well, if they go wrong ( as can happen) they may well end up with a B then I am on the carpet with senior management demanding I explain ( not your DC explain).
On the other hand, if I predict an A and your DC gets an A that?s fine, he/she did better than expected/predicted and I am clear. If he /she gets a B, I am still within tolerance (a grade either way). So you see, an A is a good place to be, A is not.
I think many teachers may take that approach whether they tell you or not.