my school's text book says the simple past and past participle forms of mend are ment ment
but some fellows say it's mended mended!
i am puzzled!
I've never heard of "ment" as the past or past participle of "mend". Mend is a regular verb (past = mended)

Meant (pronounce ment) is the past of "mean".

Maybe your book has an error.
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The past participle of the verb 'to mend' is most definitely 'mended' as in:

I mended my dress/shirt/bag/shoes/window etc. You can mend almost anything and almost anything

can be mended. Your text book is .ncorrect.
It comes from the old english tradition... from the the german tradition...

The technically correct simple past is ment, while the participle may be ment or mended. No one says ment anymore, so people just change it.

Consider the word "past"

it comes from "to pass" and once upon a time the pp and sp were "past". But now people say "passed" because it is more regular. However, the word "past" remains as a noun, and unfortunately no one makes the connection anymore.

This word, to mend, is similar.

Both "to pass" and "to mend" come from french, and route through middle english, which is why those archaic "rules" still apply.

Some other neat things
the past part. of "to put" was once "putten". weird, huh?
How can you mend a broken heart-song by Al Green
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AnonymousThe technically correct simple past is ment
It isn't. The technically correct simple past is 'mended'.
Anonymous But now people say "passed" because it is more regular.
People write 'passed'. 'Passed' and 'past' are pronounced in the same way.

Ment as the past form of mend is still used in England, or at least parts of england, in certain context, even if it doesn't show up in online dictionaries. Possibly it would count as dialect now. It crops up in at least some readings of the nursery rhyme "Jack and Jill" for example:

"...went to bed

and ment his head

with vinegar and brown paper"