Quick tips ...
a) You didn't fail the OSCP; you LEARNED how different/difficult it is in contrast (skills based vs. knowledge based) to other exams! You will have failed when you cease making attempts without success.
b) While "try harder" might sum it up for a few, I might better say "do more" as in, the labs.
How much time did you spend working with the labs? I recommend at least a month of dedicated drilling, maybe more depending on experience. Forget your boss, wife, girlfriend, dog. After a month of labs, if you don't feel comfortable/sick of drilling, get another month.
Pretty much 2hrs in I knew I wasn't ready for this. I'm still reflecting on how it went. I will share my list soon. Its 100℅ that buffer overflow so I plan to master this as it a given. Currently I'm hammering away at the machines on vulnhub and practising write ups on here.
Thanks for the reply and info. Much appriciated