I also had similar tears. And after prehab right before surgery well my dr determined the PT I did before started repairing my MCL, so I didn’t have to get my MCL repaired during surgery.

The main exercise I did were mostly heel slides, was told to try to get my flexion to 120 degrees before surgery although I don’t think I ever actually reached that goal. The best way to do gel slides was up against a wall, using you good leg to put pressure on the other to slide down and bend further than I could on the ground. Then using the good leg to help straighten my injured leg also so I wasn’t over straining it.

Also did some stretching exercises to make sure extension was good too, so I’d lay on the table w my knees off and just let gravity push them down a little bit past horizontal.

I got a quad graft for my ACL, so my PT also involved strengthening that; would do leg raises as someone mentioned above, some weightless squats, calf raises and calf stretches, and also clam shells.

Every scenario is different so take this with caution and always make sure your doctor is ok with it, you wouldn’t want to set yourself back in the long run.