Yes, you can still appear for the JEE Main exam even if you have 58% in your 12th grade and have previously taken the exam with lower scores. The eligibility criteria for JEE Main generally include:

1. Educational Qualification: You need to have passed your 12th grade or equivalent examination with at least 50% marks (45% for SC/ST/PwD candidates) in aggregate in subjects like Physics, Mathematics, and Chemistry/Biology. Since you have 58% in 12th grade, you meet this requirement.

2. Attempts: You can attempt JEE Main up to three times in consecutive years. Since you have already attempted twice, you are eligible to take the exam for the third time.

   Recommended

3. Age Limit: There is usually an age limit, but it is typically not an issue for most students as long as you are within the permissible age range.

To summarize, you are eligible to attempt JEE Main for the third time given your current educational qualifications and the number of attempts you have already taken. Make sure to stay updated with the latest information from the official JEE Main website for any changes or specific details.