GDPI Assistance Recommendations??

My CAT score: 110 (37-38-35)

Profile: 9/9/7 Fresher GEM, CFA Level 2 Cleared

I expect around 99.5% ile and will get at least one call from the top 6 IIMs.

Is prepz*ne's GDPI preparation course worth it? (it costs around 20K)

Any other suggestions for GDPI assistance?? (Cost is not a hurdle, I need the best mentor).