Left army reserve, can I join marines?

I was in the army reserve but didn't go to boot camp yet. I backed out (or so i was told i did when i applied for it) because i needed to get my grades up because i was failing a class. I did the split op which is where i go to bct between junior and senior years. So i would need to pass anyway to go to boot camp. So i spoke with my army recruited and backed out. So I got my grades up (which im good to go now). Im trying to get into the marines DEP now (which i wont back out of because i passed the class). They have to go and get my medical paperwork and discharge letter. Apparently I was never discharged from the army reserve (even though i was told i was by my recruiter). Its going through now. What kind of discharge is it? and Entry Level? The marine recruiter said I can go into the marines as through as this goes through, which may take a month??? Is there anything that can stop me from going into the marines (liked that i backed out of army reserve (tho i had to because of my grades?))? My recruiter said i should be fine, but I just want to know if I am still eligible???