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• You cannot take direct admission to the 2nd year of a Computer Science diploma course based on passing 12th standard only. Admission to the 2nd year (lateral entry) of an engineering diploma, like Computer Science, is generally given to students passing an ITI (Industrial Training Institute) diploma in a specific trade after passing 10th or 12th class, not just after passing 12th class.
• If you have qualified 12th (PCM or applicable subjects), you can take direct admission for the 1st year of the Computer Science Engineering diploma at most colleges either on merit basis or by sitting in entrance tests. For direct 2nd year admission via lateral entry, you will generally need to possess an ITI or equivalent certification, not necessarily 12th standard.

Conclusion

• After 12th (without ITI), you can take admission in the 1st year of Computer Science diploma.
• Direct lateral entry to 2nd year is usually allowed only for ITI students, not for 12th pass students.