Can I complete tax form without form 1098-T?0

No you are not required to have a 1098-T to file, however I would recommend you wait until you receive it.  If you have not received it I would contact your learning institution and request one.  Schools must send the form to the student by January 31 and file a copy with the IRS by February 28.

Educational Credits can be substantial and the 1098-T contains valuable information.

Schools must send Form 1098-T to any student who paid "qualified educational expenses" in the preceding tax year. Qualified expenses include:

• tuition,
• any fees that are required for enrollment,
• and course materials required for a student to be enrolled.

Tuition-paying students at eligible colleges or other post-secondary institutions should receive a copy of Internal Revenue Service Form 1098-T from their school each year.  Eligible institutions include most colleges, universities, and vocational schools that are eligible to participate in the Department of Education’s student aid programs. This form provides information about educational expenses that may qualify the student—or the student's parents or guardian, if the student is still a dependent—for education-related tax credits.

If someone else pays such expenses on behalf of the student (like a parent), the student still gets "credit" for them and receives the 1098-T.