Hello Harish,
No ,CET is not necessary for Plain BSC but 10 th and12th marks matter a lot. If you score good, you have choice of choosing what to do in BSC but if you take 12th lightly you will have to settle with the circumstances. And even if you give CET as a try but have given board exams with full focus, you can still have a decent score. After all PCM CET is based on 12th syllabus only.
But in case of Bsc in forestry ,agriculture,etc. CET is the basis for admission.You should try to score as well as possible in your CET examination to stand a chance to get admission.
All the best !
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