Feeling stuck on consulting prep - 100% focus on prep OR work at strategy boutique simultaneously while preparing?

Previously I was apply for entry positions in tier 2 and big 4 consulting, & received couple of invitations to tests from OW, OC&C, IBM, Deloitte Switzerland, boutiques & some others.

Should I regard these invitations as a sign that there is a chance for me to get a job offer if I pass the tests, case interviews & fit? I believe the answer is yes.

My main target is to get into Oliver Wyman or other tier 2 consultancies.

I am preparing simultaneously for all of the parts, while numerical test will be the first. However now I feel stuck & indecisive on couple of issues.

1. I feel like I spend too much time on preparing. I'm doing it already for couple of months and there is a progress, but i do not receive feedback on my progress so the process is not interactive. I might use a coach or mentor?

2. I am unemployed after graduating with MSc & worried that i'm not gaining experience while solely preparing for interviews, while I might not even get the offers.

3. I feel like I have good chances to get employed in a strategy boutique owned by ex-mckinsey associate.

The main question is:

**Would getting into strategy boutique be useful for consulting prep & getting into OW or other tier 2 consultantcies OR it will impede my consulting prep & I rather focus 100% on preparation? **

Thank you in advance for your opinions.