For the breadth options, most of them won't make a difference, pick the easy ones to boost your GPA
And the easiest breadth vary depending on the person, when you get to uni you can decide for yourself (typically no exam is a good sign, or if it's not an academic subject like Choir or Australia in the Wine World)
how do they work out GPA if the class is only Pass/Fail ?
Even if there are no exams, there should be assignments, performances or essays or some form of assessment,
Even for
choir:Assessment will be on a pass/fail basis and will be based on preparation of parts, individual and/or sectional practice and active participation in all rehearsals, classes and performances as directed (75%); attendance and submission of a concert report of three appropriate concerts (500 words each, due weeks 4, 8 and 12) (25%). Less than 80% attendance will result in a fail. All assessment components must be passed in order to pass the subject, including the timely, satisfactory completion of all three concert reports.
And
Australia in the Wine World:Examination - Theory (2 hours) = 40% (During Teaching Block)
Examination - Practical (1 hours) = 20% (During teaching block)
4 online quizzes = 20% ( one each week following the teaching block)
Practical book = 20% (Submitted 4 weeks after the teaching block)