What are the chances of getting into popular year 2 engineering programs such as mechanical, electrical, and civil without free choice? Or am I pretty much doomed and need a 10+ gpa

Varies every year. Depends on the performance of your peers going in to those programs. Generally a 7-7.5 gets you through to any program except Elec & Biomed, I think.

Varies but having an 8+ pretty much guarantees anything