Oxford University is a highly competitive institution, and admission requirements are stringent. Let's break down your chances:

Academic Requirements

1. A-levels or equivalent: Oxford typically requires A_A_A or A*AA in A-levels. For Indian students, this translates to 90% or above in your 12th standard board exams.

2. Average score: Your 85% average might not be competitive enough for Oxford.

Standardized Tests

1. SAT: A score of 1500 is good, but Oxford doesn't specify a minimum SAT score.

2. IELTS: A band score of 7 is acceptable, but Oxford often requires a higher score, typically 7.5 or above.

PAT Preparation

1. Physics Aptitude Test (PAT): If you're applying for a physics-related course, PAT preparation is essential.

Admission Chances

Given your academic record and test scores, admission to Oxford University might be challenging. However, it's not impossible. Oxford considers a holistic approach, looking at:

1. Academic achievements

2. Standardized test scores

3. Personal statement

4. Letters of recommendation

5. Interviews (if applicable)

Recommendations

1. Improve academic scores: Focus on securing higher scores in your 12th standard board exams.

2. Prepare for Oxford's admissions process: Familiarize yourself with the university's requirements and prepare accordingly.

3. Consider other top universities: Look into other excellent universities that might be a better fit for your profile.

While Oxford is an excellent choice, it's essential to have a balanced list of universities to apply to. Good luck with your applications!