Yes, you can apply for the BPSC Civil Services exam even if you are from a different state. The Bihar Public Service Commission (BPSC) conducts the Civil Services exam to recruit candidates for various administrative positions in the Bihar state government. The exam is open to candidates from all over India, as long as they meet the eligibility criteria set by the commission. Here is a detailed explanation of how you can apply for the BPSC Civil Services exam as an out-of-state candidate.

Eligibility Criteria:
- Educational Qualification: To be eligible for the BPSC Civil Services exam, you need to have a bachelor's degree from a recognized university or institution.
- Age Limit: The age limit for general category candidates is usually between 20 to 37 years. However, there are relaxations in the upper age limit for candidates belonging to reserved categories.

Application Process:
1. Notification: Keep an eye on the official BPSC website or leading newspapers for the release of the exam notification. The notification contains all the important details such as exam dates, eligibility criteria, syllabus, and application procedure.
2. Registration: Visit the official BPSC website and register yourself as a new user. You will be required to provide basic details such as name, email address, mobile number, etc. After successful registration, you will receive login credentials.
3. Application Form: Log in to your account using the provided credentials and fill out the BPSC Civil Services application form. Make sure to enter all the required details accurately and upload the necessary documents such as photograph and signature.
4. Application Fee: Pay the required application fee through the available online payment modes. The fee amount varies depending on the category you belong to.
5. Submission: After completing the application form and fee payment, submit the form online. Take a printout of the submitted application form for future reference.

Preparation:
- Syllabus: Go through the detailed syllabus provided by the BPSC for the Civil Services exam. It includes subjects like General Studies, General Science, Indian History, Indian Polity, Geography, Economy, etc. Prepare a study plan accordingly.
- Study Material: Gather the necessary study material such as textbooks, reference books, previous year question papers, and online resources to aid your preparation.
- Mock Tests: Practice mock tests and solve previous year question papers to get an idea of the exam pattern and improve your time management skills.
- Stay Updated: Keep yourself updated with current affairs, national and international news, government schemes, and policies as they play a crucial role in the General Studies section of the exam.

Conclusion:
In conclusion, as an out-of-state candidate, you are eligible to apply for the BPSC Civil Services exam. Make sure to fulfill the eligibility criteria, follow the application process, and prepare well for the exam by referring to the syllabus and gathering the necessary study material. Good luck with your preparations!