исключение SQL (Неправильный синтаксис около «)»)

Question

что выше ошибка, пожалуйста, поправьте его

string cmd = @"SELECT * FROM [tbl_students] WHERE course_id=@courseId 
       AND branch_id IN(" + branchId + @") 
       AND (@firstYrPercent is null OR first_year_percent>=@firstYrPercent 
       AND (@secondYrpercent is null OR second_year_percent>=@secondYrPercent) 
       AND (@thirdYrPercent is null OR third_year_percent>=@thirdYrPercent) 
       AND (@finalYearpercent is null OR final_year_percent>=@finalYearpercent) 
       AND (@currentDegeePercentage is null OR current_degree_percent>=@currentDegeePercentage) 
       AND (@passoutYear is null OR passing_year>=@passoutYear) 
       AND (@currentBacklog is null OR current_backlog<=@currentBacklog) 
       AND gender=@sex 
       AND (@eGap is null OR gapin_education<=@eGap) 
       AND (@highSchoolPercentge is null OR highschool_percentage>=@highSchoolPercentge) 
       AND (@higherSchoolPercentage is null OR ssc_percentage>=@higherSchoolPercentage) 
       AND (@grauationPercentage is null OR graduation_percentage>=@grauationPercentage) 
       AND (@diplomaPercentage is null OR diploma_percentage>=@diplomaPercentage) 
       AND (@noOfAtkt is null OR number_of_ATKT<=@noOfAtkt) 
       AND (@date is null OR DOB>=@date)"; 

Answer 1

У вас отсутствует закрывающая скобка в конце 3-й линии:

AND (@firstYrPercent is null OR first_year_percent>=@firstYrPercent 

Answer 2

Следующая строка не имеет закрывающей скобки

AND (@firstYrPercent is null OR first_year_percent>=@firstYrPercent