Hello,

Teacher Eligibility Test is conducted for recruitment of teachers at state level, so it's mandatory you have any teacher's training program to appear for TET, it can be anything such as based on 12th educational qualification you can pursue DEd/DElEd or BEd which is based on passed graduation in any discipline from a recognized university, even being a computer science graduate you will be eligible for BEd, as there is no barrier in terms of any stream, and after completion of BEd or any other teacher's training program you can appear for TET  or CTET which is conducted at national level.