NIACL Model Paper 5 with solutions for free online practice

Statements :   Some pens are books.
Conclusion :    Some books are pens, (conversion)

Statements :   All pens are keys.
Some books are keys.
(I + A = I-type conclusion)
Some keys are books. (Conversion)
∴ II follows.
Statements : Some pens are books

All books are ledgers.
Conclusions :   Some pens are ledgers.
(1+A = I-type)
Some ledgers are pens, (conversion)

Statements   All pens are keys.
Conclusions   Some ledgers are keys. (1+A = I-type)
∴ I follows.