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All answers having "Study" as clue:

3 Character Answers:

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CON

DEN

PET



4 Character Answers:

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CRAM

PORE

READ

ROOM

SCAN

SESH

UPON



5 Character Answers:

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LEARN

NERDS



6 Character Answers:

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BONEUP

NATURE

PERUSE

POLLED

READUP

REREAD

REVIEW



7 Character Answers:

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EXAMINE

LIBRARY

PERUSAL

PREPARE



8 Character Answers:

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BONEUPON

LOOKINTO

POREOVER

READUPON

RESEARCH

SCOPEOUT



11 Character Answers:

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HITTHEBOOKS