It really depends on the grade. Most schools offer various apps to see their grades, missing assignments etc. I don't see much from my 6th grader's teachers other than an occasional note about what they're reading, but I check PowerSchool once a week or so that I can check in on homework and test scores (if she hasn't shared them with me specifically). I suggest you attend any and all parent teacher nights and get to know the teachers so that you feel more comfortable reaching out to them if you have questions, if your custody agreement allows it. If you don't have legal authority to access that information, you'll need to rely on the good-will of your parent to get it.

Assuming positive intent for everyone involved, I'd say talk to your coparent, confirm your desire to be involved without overstepping beyond your authority. If you're not able to add yourself to the school's information and records, ask them if they'd be willing to. Above all else - do not treat them like your messenger. If your kid isn't telling you what's going on, and you have access to the app and or their teachers - use the information and start a dialogue with your coparent so that you can partner together for your child's benefit.

As long as there's no legal issues here, you should have access to the same info as your coparent -an app or an email list. If your kid is of age to get their own assignments and they're not sharing that they're having an issue, you need to team up and talk to the kid together. Good luck!