It is not true that "baptism" will make your life better/easier. The organization will always be on your case about something; therefore your mother would likely do the same. After baptism, then it would be expected to pioneer, not go to college, this rule, that rule, never ending.
Try to keep the peace with your mom. Compliment her for her normal real things, meals etc.
Fortunately, your insights are good at your age. Save your energies for your personal development. Try to achieve your schooling with a plan. Get involved in wholesome extracurriculars at school. Find friends who are achievers.
So many best wishes to you as you gain personal freedom of mind and heart!