@Geno
Adding to what others have said;
I'm not a Muslim, but I'm in a similar situation here.
I really want to go and do the thing I think is right, but that would hurt my mom, in a moment she is really shaken and weak emotionally.
I know exactly how you feel.
In my case I can't, and it seems you have already talked to her, but did you explain your actual reasons to her?
I don't know your mom, but do you think that, upon listening to your point, your mom could accept it better? I mean, she may have the wrong impression, she may think you want to go because of different reasons.
Or, if you choose to stay, maybe could you both find a middle ground (like, she could celebrate Christmas, but not eat Pork, or something like that)?
Writing things on the paper and reading that before saying them helps a lot, you know, to reflect about what she could say, what you could respond, and trying to put it in a way she doesn't misunderstand you. That + what CCS said about tables.
I don't have much advices about school and studying, as most stuff was already said.
After reading your 1st post, I thought: "I myself would move in that case, I'd feel better and it could hurt my mom at first, but as time passed by the wounds would heal, and I think she would be happy to know I'm happy too", but now it seems to be more complex.
I wish you find the best way out. Well, remember you inevitably will need to talk to her and decide your future, and as I have already said, time shall cure the wounds.
In my own case, though, I'm just trying to make her proud, and comfort her, until I can do what I really want to, pretty much like you are right now.
Sorry for making a long post
_________________CANDLEMASS - Dont Fear The Reaper (Blue Oyster Cult Cover - Ep 2010)