Lets first start with First Level Exam of UPSC Civil Services. In 2017, UPSC Prelims exam will be held in June. Candidates have already applied for it in March through online application. This prelims is same for IAS and Indian Forest Services.
This exam will be purely of objective type questions. Most important part is General Studies in IAS exam. You need to make it strong if you are planning to serve the nation by clearing UPSC exam.
Now come to the basic educational qualification which is required for UPSC. This is graduate from any recognized university.
Obviously syllabus for Prelims will be of graduation level. Apart from general awareness paper you will be checked for reasoning, general english and aptitude too. Your subject specific knowledge will also be checked with an objective type paper.
So, prepare your subject which you are going to opt for mains as an optional paper.
You can take this paper in Hindi also if you are not comfortable in English.
I wish you good luck for your exam. For preparation of UPSC Prelims click on the link.
Author is one of the Toppers of UPSC Exam