Question about SR

My IFT date is coming up and I have some general questions about SR.

What are some things I can do now to help me get in that field?

What’s a good rucking weight/distance to aim for?

Should I be trying to study relating topics before even getting into the pipeline, or is it smarter to wait for the “official” academics?

I know info on SR is limited so any answers would be appreciated. Thanks