Hello,

See when it comes to admission through entrance test in any university, then your 12th marks are only considered to determine the eligibility criteria as in terms of whether you fulfill it or not, other than this prepare well for the entrance test, and give your best, be thorough with the syllabus, keep resources limited, revision is the key for retaining the information you're reading, CUET scores are going to be accepted for the following universities;

• University of Hyderabad, Telangana
• Jamia Millia Islamia, New Delhi
• University of Delhi,New Delhi
• Jawaharlal Nehru University, New Delhi
• Banaras Hindu University, Uttar Pradesh
• English and Foreign Languages University, Telangana
• Maulana Azad National Urdu University, Telangana
• Mahatma Gandhi Central University
• Hemwati Nandan Bahuguna Garhwal University, Uttarakhand
• Visva-Bharati University, West Bengal
• University of Allahabad
• Rajiv Gandhi University, Arunachal Pradesh
• Nalanda University, Bihar
• Dr. Rajendra Prasad Central Agricultural University, Bihar
• Tezpur University, Assam
• Nagaland University, Nagaland
• Central University of Odisha
• Pondicherry University
• Indian Maritime University, Tamil Nadu
• Babasaheb Bhimrao Ambedkar University, Uttar Pradesh
• Tripura University, Tripura
• Rani Lakshmi Bai Central Agricultural University, Uttar Pradesh
• Rajiv Gandhi National Aviation University, Uttar Pradesh
• Mizoram University
• North Eastern Hill University, Meghalaya
• Guru Ghasidas Vishwavidyalaya,Chattisgarh
• Central Tribal University of Andhra Pradesh
• The National Sanskrit University, Andhra Pradesh
• The Central Sanskrit University, New Delhi
• Shri Lal Bahadur Shastri National Sanskrit University, New Delhi
• Sikkim University
• Manipur University
• Dr. Harisingh Gour Vishwavidyalaya, Madhya Pradesh
• Mahatma Gandhi Antarrashtriya Hindi Vishwavidyalaya, Maharashtra
• The Indira Gandhi National Tribal University, Madhya Pradesh
• Central University of Himachal Pradesh
• National Sports University, Manipur
• Central University of Kashmir
• Central Agricultural University, Manipur
• Central University of Jammu
• Central University of Punjab
• Central University of Haryana
• Central University of South Bihar
• Central University of Karnataka
• Central University of Rajasthan
• Central University of Jharkhand
• Central University of Kerala
• Central University of Andhra Pradesh
• Assam University, Silchar
• Central University of Gujarat
• Central University of Tamil Nadu
• Aligarh Muslim University

When it comes to UPSC there is no such restrictions in terms of belonging to specific stream, you just need to pass graduation in any discipline from a recognized university, there is no specific aggregate required this, yes coming from humanities background you may have advantage of being well -acquainted with the subjects included in UPSC syllabus, and there is considerable overlap with optional subjects as well as in case of law, economics, history, sociology, public administration, political science, geography etc, however if you go by previous year trends then toppers come from various background that of engineering, medical , commerce etc, hence your graduation subject isn't the only determinant factor for the success of UPSC.