You cannot take the burden of doing two degree for sure. Semester exams mostly all start around the same time. So if you enroll for IT course, they too will have semester exams which will coincide with diploma exams. What will you do then ? You can enroll for certificate courses, if you think you want to learn something else too.
If you need any help in ur Electronics coursework, you can contact me. I know internet has lot of stuffs, but still I'm open for any clarifications. Btw could u list what are the coursework you are finding difficult or having backlogs ?