B.Com in Mumbai

No, St Xavier Mumbai has also Online Application Submission System. You can apply through website. No need To Go To College Physically.
St. Xavier's Mumbai Application.
If you are looking to apply for admission to St. Xavier's College in Mumbai, you can follow these steps to obtain the application form:
Visit the official website of St. Xavier's College Mumbai (http://www.xaviers.edu/).
Click on the "Admissions" tab on the homepage.
Select the program you want to apply for (undergraduate or postgraduate) and click on the "Apply Now" button.
Register on the admission portal by providing your personal details and creating a password.
Login to the admission portal using your registered email address and password.
Fill in the application form with your personal, academic, and contact details.
Upload the necessary documents, such as your photograph, signature, mark sheets, and certificates.
Pay the application fee online through the available payment modes.
Submit the application form and take a printout of the confirmation page for future reference.
Note: The application process and deadlines may vary depending on the course you are applying for, so make sure to check the official website for the latest updates.

Well, all students enrolled in UG and PG programmes at any university, particularly Mumbai University, must maintain a 75% attendance rate. In actuality, students who have 100% attendance now receive 5 marks. Any student who does not maintain the required level of attendance will not be permitted to take the final or additional exams. They must enrol or be admitted as new candidates, maintain a 75% attendance rate, and then show up for the final exams. You are only enrolled for the first year, as you stated, therefore don't take this chance and keep taking classes until you have at least 75% attendance. Alternatively, you can apply for re-admission, in which case you must begin with the first semester once more and pay all applicable fees. I'll suggest you to be engaged in your studies and keep going to class because this sounds so reckless and frantic.