Birthday gifts for classmates can be crystal display tables, sun jars, cute teddy bear dolls, etc. It is more lively to celebrate birthdays together. One can give a crystal display table and the other a sun jar. In short, they should not be the same.
Celebrating birthdays together can be more lively. Invite all the roommates to go out for a meal or something, sing together, and have fun. Send birthday cakes on birthdays, preferably a bigger one, which is more face-saving. You can also DIY a more special birthday cake to let your two birthday classmates feel your heart.
You are high school students, and you are also at the age of loving beauty. It is also good to give good skin care products or more fashionable pendants. Handmade customized name necklaces can be given the same gift, but it is better to engrave their respective names for free.