Hey !
Inorder to become a digital marketing manager you can take up bachelor's degree in computer science or information technology (as technical + management skills can pay you much), Then master's degree in business administration .
There's no set entry route, but many employers prefer you to have a degree or equivalent qualification in marketing, management, business or a related subject. They may also expect you to have some experience of working in  a marketing role and have knowledge of digital marketing.  Check the below link for more info regarding digital marketing.
https://bschool.careers360.com/articles/digital-marketing-connects-world
Hope this helps
All the best !

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