No, not all students are required to reside in a hostel after securing a seat in the first round of counseling for medical or other courses. The requirement to stay in a hostel depends on the specific policies of the college or university you are admitted to.

Some institutions, particularly those in more rural or remote areas, may require students to stay in hostels to ensure their safety, convenience, and to foster a focused academic environment. In such cases, hostel accommodation might be mandatory, especially in the first year.

However, many colleges, especially those in urban areas or with a larger student body, offer students the choice of either staying in the hostel or making their own accommodation arrangements off-campus. If you prefer to live off-campus, it's important to confirm with the institution whether they allow it and if there are any specific procedures or permissions required.

If staying in a hostel is mandatory, the college typically informs students during the admission process or in the joining instructions. Always check with your college's administration for the exact details related to hostel residency requirements.