stata - Creating a flag using indexes -

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i'm looking build flags students have repeated grade, skipped grade, or have unusual grade progression (e.g. 4th grade in 2008 , 7th grade in 2009). data unique @ student id-year-subject level , structured (albeit more variables):

id    year    subject    tested_grade     1     2011      m            10             1     2012      m            11                   1     2013      m            12 2     2011      r            4 2     2012      r            7 2     2013      r            8 3     2011      m            6 3     2013      m            8

this code i've used:

sort id year grade gen repeat_flag = .      replace repeat_flag = 1 if year!=year[_n+1] & grade==grade[_n+1] ///         & subject!=subject[_n+1] & id==id[_n+1]     replace repeat_flag = 0 if repeat_flag==.

one problem there lot of students took test in 6 grade, didn't take 1 in 7th , took 1 in 8th grade. varies across years , school districts, school districts adopted tests in different years different grade levels. code doesn't account this.

regardless though think there must more elegant ways , side note wanted know if use of indexes appropriate problem this. thanks!

edit included sample of data looks above in response 1 of comments below. if still not clear feedback welcomed.

what may seem anomalous students progressing faster or more in tested grade passage of time imply. that's possibly 1 line grunt work: 

clear  input id    year  str1  subject    tested_grade     1     2011      m            10             1     2012      m            11                   1     2013      m            12 2     2011      r            4 2     2012      r            7 2     2013      r            8 3     2011      m            6 3     2013      m            8 end  bysort id (year) : gen flag = (tested - tested[_n-1]) - (year - year[_n-1])   list if flag != 0 & flag < . , sepby(id)        +---------------------------------------+      | id   year   subject   tested~e   flag |      |---------------------------------------|   5. |  2   2012         r          7      2 |      +---------------------------------------+

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