If you have scored 253 marks in PCM board subjects and 58 marks in KCET PCM paper, here is a detailed prediction and explanation about your KCET rank:

• KCET Rank Calculation :
  KCET rank is based on 50% weightage from PCM board marks and 50% weightage from KCET PCM marks.
  Your board marks are out of 300 (since PCM).
  253 out of 300 means approximately 84.33 percent in boards.

• KCET Normalization :
  Your KCET marks in PCM are 58 out of 180.
  58 out of 180 means approximately 32.22 percent in KCET exam.

• Predicted Rank Range :
  Considering your good board marks (84.33 percent) but lower KCET score (32.22 percent),
  your rank may be somewhere between 55000 to 80000 approximately.
  Please note this is only a rough prediction and the actual rank may vary slightly based on competition and category reservation.

Conclusion:

With 253 PCM board marks and 58 KCET marks, your predicted KCET rank is between 55000 to 80000 approximately.
You still have good opportunities in private colleges. Stay positive and plan your choices well.

Based on your KCET score of 58, your estimated rank could fall between 25,000 to 40,000, based on historical trends.

This is just an estimate, and the actual rank may vary depending on the competition and the normalization process.