Hi. You can check your result by logging in to the portal - cbseresults.nic.in
Then, click on 'CBSE board Class 12 Result'.
Enter your roll number and other required details. Once you submit your details, the results should be displayed on your screen.

Dear student,
Central Board of Secondary Education (CBSE) has announced the CBSE result 2020 12th Class students on July 13 at 12.40 am. CBSE 12th class result 2020 is available oncbseresults.nic.in

For more info you can refer to this link
http://news.careers360.com/cbse-result-2020-date-class-10th-and-12th-result-be-declared-july-15

Hope this helps.