Hi Aspirant,
Hope you are doing great as per the question asked by you, as you have secured decent rank and you waiting rank around 3600 in I.I.M ranchi waiting list so you are having good chances of converting into it as you are advised to wait patiently till further rounds of cutoffs and be patient. You may certainly get admissions in I.I.M ranchi as per previous year cutoff trends.
Hope you found this answer useful. Stay motivated stay positive.
All the best!
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile