Being an Engineering - graduate in computer - science does not mean that you are not eligible the profession of a teacher in a high/ middle school. At 10+2 level, there is a provision for selection of Computer - science from some of the aspirants and as such the School - authorities has to take care of the need of the students by recruiting Computer - teachers. Not only CBSE circular maintain this provision, even the students of ISC are being coached Computer - science to make the student competent in this field.
In a Government - high school also, there is recruitment of Computer - teachers to teach Computer - science. Later on, B.Ed can be pursued with a recognised university for better prospects in the teaching - line.
For a primary - school teacher, a short training course ranging from nine to twelve month is required.
However, being a lecturer in a junior college, you should have a post graduate degree followed by clearance of National - eligibility Test conducted by CBSE. This test is held twice a year.