So did you do the following below?
Students who were dismissed from the University and are seeking readmission into a CHASS major should schedule an appointment with an Academic Advisor in the Student Academic Affairs Office. In many cases, students will be asked to complete UCR courses through Concurrent Enrollment at UCR Extension Center or through UCR Summer Sessions in order to repair their GPA. Academic Advisors will provide additional details on readmission requirements specific to the student’s situation. Students will also have to meet with the Departmental Academic Advisor for approval to readmit into their major. After they have met all of the requirements, they can apply for readmission.
If you did not get an academic plan from a UCR advisor then it might be problematic for readmission especially since it has been a year since the dismissal. Still unsure on why you did not seek out help and determining what you needed to do for readmission to UCR. I personally think that ship has sailed and you need to find another school where you can complete your degree. Schools are not going hold your hand and tell you what you need to do. You need to be proactive and find seek out the information you need to succeed.