Dear Shantilata

There is no minimum marks you need to score in OUAT entrance exam to ensure the admission, instead you must target to score as high as you can.

The merit rank and list of OUAT for admission into B.Sc. (Hons.) Agriculture, B.Sc.(Hons.) Horticulture, B.Sc.(Hons.) Forestry, B.F.Sc., B.V.Sc. & A.H., B. Tech.(Agril. Engg.) and B.Sc.(Hons.) Community Science is prepared on the basis of Class 10 and 12 marks and entrance exam marks. The final score in OUAT 2018 will be determined by considering: 

25% of the marks scored in Class 10 + 25% of marks in Class 12 + 50% marks of OUAT entrance exam

So, a combination of your academic career and entrance marks will determine your chances of securing a seat. Also note that some courses like Veterinary Sciences, etc. are popular and thus only top rankers are able to secure a seat in these courses. 

All the best!