private async Task <Guid?> SaveExamLogs(ExamForRenderDTO examRaw, Guid destId, Guid?instructor)
        {
            var examLog = new ExamLogDTO
            {
                RenderExamType      = examRaw.RenderExamType,
                Name                = examRaw.Name,
                RawExamRendered     = JsonConvert.SerializeObject(examRaw),
                ExamCatInstructorId = instructor,
                DestinationId       = destId,
                ExamCategoryId      = examRaw.Id
            };

            var res = await _ExamLogService.CreateAsync(examLog);

            if (res.Success)
            {
                return(res.Data.Id);
            }
            else
            {
                return(null);
            }
        }