If you have really work hard in the last 4 months then you should definitly not worry, only solve the previous year papers. The eligibility criterion for college admission have also been changed by NTA. So from this year you have to focus just on the JEE syllabus and 12th board minimum marks were 75% but for this year you need not to focus on 12th board marks. And there will be tremendous competition as their has been a great suspense so

All the best!!!