PSU Syllabus is basically divided into 4 main subjects -

(1)  General Aptitude & Reasoning

(2)  General English

(3)  Technical Knowledge

(4)  General Knowledge & Current Affairs

For GK and current affairs syllabus will be history of India, Geography, basic terminologies of biology and chemistry, politics of India, for current affairs you must need to keep yourself updated with the latest of news.

General Reasoning might have topics like Venn Diagram, puzzle test, blood relations, coding/decoding, direction sense test, cubing, paper cutting, etc.

For general aptitude you will need to cover topics like Time and Distrance, Speed and Acceleration, ratio and proportion, profit and loss, simple and compound interest,m area and volume, etc.

For General English you need to know the basic grammar ie tenses, direct indirect speech, voice, idioms, phrases, etc.

Best wishes. Thankyou.