to be troubled; to have difficulty; to be bothered; to be inconvenienced; to be badly off; to be hard up
enjoyable; fun; pleasant; happy; delightful
quarrel; argument; row; (verbal) dispute
to meet; to encounter; to see; to have an accident; to have a bad experience
structure; construction; arrangement; plan; plot; contrivance
big; large; loud; extensive; spacious; important
to differ; to be different; to disagree; to vary; to diverge
to put in; to let in; to admit; to accept; to accept; to comply; to include
parent; parents; dealer; banker; founder; inventor; (pet) owner
to branch; to fork; to separate; to split; to disperse; to scatter
not exceeding ...; not more than ...; below (a standard, level, etc.); under; the following; the below-mentioned
lower grade; low class; junior (officer)
by gender; according to gender; gender-segregated
academic year; school year; year in school; grade in school
because ...; for ...; the reason being ...; as for ...; when it comes to ...; regarding ...
year; age; years; past one's prime; old age
being enrolled (at a school); being registered; being a member (of a team, organization, etc.)
pupil; student; schoolchild
... years old; age (of) ...
examination; exam; test; trial; experiment; test
passing (an exam); pass; success; meeting (specifications, standards, etc.); passing (inspection); qualification
when; at what time; how soon; normal times; ordinary days
graduation; completion (of a course); moving on (from); outgrowing (something); leaving (a group, company, etc.); quitting
serious; earnest; sober; honest; sincere
lesson; class; teaching; instruction; classwork; schoolwork
it seems that ...; it appears that ...; is like ...; is similar to ...
admission (to a school or university); entrance; enrolment; enrollment; matriculation
already; previously; before; undeniably; unmistakably
many; numerous; large amount of; large quantity of; frequent; common
classroom learning (as contrasted to practical training); classroom lecture; desk study
each (person); everyone; individual; respective
to be sufficient; to be enough; to be worth doing; to be worthy of; to do (the job); to serve
necessary; needed; essential; necessity; need; requirement
to go to and from (a place); to go back and forth between; to go to (school, work, etc.); to attend; to circulate (e.g. blood, electricity); to be communicated (e.g. thought)
wholly; solely; entirely; principally; mostly; chiefly
to build; to construct; to erect; to build up (a reputation, position, fortune, etc.); to establish (a relationship, household, tradition, etc.); to lay (a foundation)