OJEE showed my 12th marks as 62% (based on MPC + optional), but my actual board percentage is 82%. During placements, which percentage will companies consider?

During placements on campus, recruiters will take your real 12th board percentage (according to your marksheet), not the OJEE-estimated percentage based on MPC + optional.

The 62% as estimated by OJEE will be kept in mind only for counselling and eligibility at the time of admission.

For placement, your true board result (82%) is what will be utilized by the recruiters to verify whether you are eligible according to their criteria (in general, 60%+ in both 10th and 12th).

So don't fret — your 82% will be considered in placements, not the OJEE percentage.