Yes, you can.
Both these exams will be conducted in different sessions.
If you want to appear in IIT JAM Exam then you must download you admit cardfirst. IIT JAM 2019 Admit Card is the most important document. Without this you will not be allowed to appear in the exam.
IIT JAM 2019 Exam will be on 10th February 2019 in two sessions.
Session 1:
9:30 a.m. - 12:30 noon
Biotechnology (BT), Chemistry (CY), Geology (GG) and Mathematical Statistics (MS).
Session 2:
2:30 p.m. - 5:30 p.m
Biological Sciences (BL), Mathematics (MA) and Physics (PH).
Best of Luck!