That's awesome to have a Coke Internship on your resume. Often startups can give you amazing valuable experience but they are barely known and it is hard to verify all the details but having a strong brand like Coke will be super helpful for your resume.

I think you have a great profile. Taking the GRE and preparing can be tricky but I would apply with whatever you have and see if that sticks. You have an attractive and unique profile, so perhaps they will overlook a sub-par score, which I would explain in separate letter note you simply did not have the proper time to prepare for. I have seen business schools take talented candidates with low scores but there are only so many spots for so many talented people so the higher the score you can get the better, as it is the biggest bottleneck for your profile at this time.

Should I add my Coke internship on my CV ( on a future date). Since i am planning on applying in December and I will be joining Coke in February.