The Preliminary Test is the same for both UPSC civil services exam and Indian Forest Service (IFS/IFoS) Exam.
| Paper | Subject | Marks |
| Paper-I | General English | 300 |
| Paper-II | General Knowledge | 300 |
| Papers -III, IV, V, VI | Any two subjects to be selected from the list of the optional subjects. Each subject will have two papers. | 200 for each paper = 800 |
| Subtotal | Written Test | 1400 |
| Personality Test | 300 | |
| Total | 1700 Marks |
General English
Candidates will be required to write an essay in English. Other questions will be designed to test their understanding of English and workmanlike use of words. Passages will usually be set for summary or precise.
General Knowledge
General Knowledge includes knowledge of current events and of such matters of everyday observation and experience in their scientific aspects as may be expected of an educated person who has not made a special study of any scientific subject. The paper will also include questions on Indian Polity including the political system and the Constitution of India, History of India, and Geography of a nature which the candidate should be able to answer without special study.
Optional Subjects
(i) Agriculture
(ii) Agricultural Engineering
(iii) Animal Husbandry & Veterinary Science
(iv) Botany
(v) Chemistry
(vi) Chemical Engineering
(vii) Civil Engineering
(viii) Forestry
(ix) Geology
(x) Mathematics
(xi) Mechanical Engineering
(xii) Physics
(xiii) Statistics
(xiv) Zoology
Provided that the candidates will not be allowed to offer the following combination of subjects :