hello   haps755

I hope you are doing good . With reference to your query ,I would glad to know you that it is better to do certifcation at the time of bca only . The course structure of bca is not very hectic , you will get time easily to boost your profile by doing extra courses. When you passed out with bca and will go for mca you will find out that you have skills that make you different form other people. At that time you will have to revise concepts and explore other things

Hope you found this answer helpful. Good luck for your future