MB2 710 - MB2 711 - MB2 712 the easiest for a CRM beginner?

Hi everyone,
I am seeking an advice on which of the following exams is the easiest to start with for a On-Premise CRM beginner:

- MB2 710
- MB2 711 
- MB2 712

for the suggested exam I would appreciate it if you mention the following:
1- How much time approximately it takes to prepare for the exam?
2- What are the best learning resources (Free or Paid) for the exam?
3- if you could tell me a brief experience you had on taking the exam. THAT WOULD BE GREAT.

Thanks in advance.