Stuck in the middle percentile range: should I go forward and buy a GDPI course?

CAT: 85%ile, XAT: 93%ile (DM: 69%). GNEF: 8/9/6. I’m really confused about what to do next. I haven’t bought a GDPI course yet because I’m unsure if I want to take admission in a tier 2 college or repeat.

That said, I do want to give the interviews to keep my options open and then decide later. Should I invest in a GDPI course now? If not, how should I prepare effectively on my own for the interviews? Would love to hear how others in the same boat are approaching this. Need advice!