Yes you can, but you need to specify that you wish to go for b Pharma and agriculture as well along with btech or BE. It may cost you more as number of courses applying multiplied by course fee i.e . 800 *3 . If the portal allows you filling up the option at the same time, you can do so. Otherwise you may need to fill the form thrice for different courses. But i think it would ask you for different options in the same form. The three exams for three different courses are at the different date slots and time. Apart from this pcm is for btech and pcb for bpharma and agricultural. In case of any discrepancy just go for the most preferred option among the three.

All the best : )