Just some questions on the primary app

[trustme12]

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Here they are

1.I read on here that it has to be in chronological order is this true?
2.Also for experiences I want to put my leadership positions there is no selection for that in the apps how should I list it?
3.Also I used bullet points for my key responsibilities is this ok?
4. I'm taking a summer biochemistry course, should I wait till I get the grade till I submit? I don't have a high gpa and I need more upper division, would submitting early outweigh a small bump in my gpa ( don't have a lot of upper division science courses)?

also I took a cpr course once I got a certificate is this significant?

thanks everyone!