You can download the pdfs of the answer key for shift 2 of physics, chemisty, maths form here and check the answers of the questions asked to see if you have marked them correctly or not. To know bonus questions I also recommend you to visit YouTube as many channels have uploaded videos on paper analysis there where they discuss a lot of things about the Jee paper held on various dates. https://news.careers360.com/jee-mains-2021-july-27-shift-1-and-2-unofficial-answer-key-released-download-pdf