hi,

see there is around 101 subjects in ugc net, and 5 topics are in CSIR net, you are eligible tp appear in csir net exam from mathematics stream, in ugc net exam for engineering graduates in ece/cse/ee/or any other circuit branch students the appropriate subjects is available in ugc net exams are

Computer Science and Applications

Electronic Science

as per your background you may choose computer science and application as a subject in ugc net exam.