Greetings! How are you? I just want to congratulate you for your grades in school. I know that you've been putting a lot of effort and I'm glad the hard work is paying off.
About your problem I would recommend you to make pro/cons list in order to know what is better for you now and in that way take a better decision. I don't mean that you should not buy the game but probably this is not the right moment to do it, because you're still in school.
I know that the video game you're trying to get is limited edition and I know this may be the only opportunity to buy it but I can assure you that next year there would be even greater games, so don't take your decision based on that.
Finally, I would like to send greetings to your family and to let you know that if I can do anything to help you taking this decision just tell me.