Assessment system in moodle

We want to develop a system to assess our students on the moodle (or similar) platform. The tasks would include : a) setting up moodle b) setting up a module via which we can input objective (and written) questions to the system c) questions could be tagged or arranged as per different subjects / topics etc. d) generating tests/assessments using the system - which can be allocated to the student and after they appear for the test - the results is emailed and also stored in the system e) some reports etc. would also be needed.