The Cambridge Colleges will not normally consider applications to Cambridge from students enrolled on degree courses at other UK universities unless there are exceptional circumstances or there is a change of subject (in which case a letter of support from the student's current institution is required). If in doubt, applicants should contact individual Colleges for further guidance.
Any application to study at Cambridge would need strong support from your course director or other academic tutor at your current university. A reference/letter of recommendation from that person to the Cambridge College would be required before a Cambridge College could consider an application, and such applications would still be subject to the same academic assessment as any other application to the University.
Please contact a College admissions office for advice.