can a student with 83.3%(pcm aggregate) get a rank within 500 in kcet??

The marks you will get in KCET is entirely dependent on the performance in the KCET examinations not on aggregates. Now its dependent on your honesty what your situation is. Having a good or moderate percentage can't satisfy the possibility of performing well in any entrance examinations. Every entrance examination have its own strategy and you should focus on those factors to score well on the examination. 88.3% is a good marks and you must have a more than average intellect. So you can obviously do it, just some hard work and confidence is required in order to get under 500 rank in KCET.

To know more about KCET 2021 you can visit the link below:

https://www.careers360.com/exams/kcet

For KCET preparation strategy you can visit the link provided below:

https://engineering.careers360.com/articles/how-crack-kcet

I hope my answer helps. All the very best for your future endeavors!