The answer varies tremendously depending on the student and also significantly on the school. For example, I found it easier to get high grades in EE classes with objective answers than can be calculated analytically than in subjective humanities classes graded on papers that cannot be calculated analytically. Most students are probably the other way around, but not necessarily most EEs.
I was an EE major at Stanford. Some documentation about the grade distribution at Stanford is at https://thelittledataset.com/2015/07/31/eduanalytics-101-an-investigation-into-the-stanford-education-space-using-edusalsa-data/ . At the time of the document several years ago, the student reported median GPA in engineering classes was 3.67, with ~70% of students receiving grades of A- or better. The mean engineering GPA was a bit higher that the mean GPA reported by the other schools. This fits with my experience in EE classes as well. The median grade was typically either A- or A . As you’d expect with such a distribution, having GPAs above 3.7 was common. I knew one engineering major who graduated with a ~4.2.
If you aren’t interested in engineering, it does not bode well for getting high grades, law school, your personal happiness, and your life in general. Maybe you could talk to your parents about what majors do interest you, how those majors would better assist with your law school goals, and what you’d do with the major as a backup if law school didn’t work out.