Does tier 3 college bsc biotech and my 12th marks affect IIM selection?Profile evaluation

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NEET aspirant partial drop l currently doing bsc biotech from geu which is tier3 missed mbbs cutoff now preparing for cat iK it is also difficult like in competition my target is 99.5+PERC PROFILE GNEM 10th-90.5%,12th-80%,grad currently 1yr passed 9cgpa does mycollege tier3 effect on my selection??I WANT TO GO IN MARKETING TRYING TO FINDING INTERSHIP IN MARKETING BUT CAN I GET INTO IN HUL AND P&G LIKE COMPANIES IF GOT IN TIER 1??OR IT WILL BE DIFFICULT AS THEY GIVE PREFRENCE TO SRCC LIKE TIER 1 COLLEGES

I WANT A REALITY CHECK ??