Those are some pretty personal questions; and I will answer one of them.
No, you absolutely do not need your gang leadership permission to attend college or trade school. However, you must notify them and make them aware if you will be enrolling in college, or moving away for education or specific job training.
I know Bloods that became cops or joined the military and still stayed Bloods, though it certainly isn't the norm.
I still banged all throughout college and med school.
That's all the information I feel like sharing at this juncture.