Here are my thoughts for suitable material for cello students for this new academic year. Hundreds of ideas here!

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I’m starting off with these free volumes of music for solo cello in the style of J.S. Bach:

BREAKING INTO BACH – UNACCOMPANIED MINIATURES FOR STRINGS
Music to play at home on your own – Unaccompanied!! Music very similar to Bach composed for young and/or less experienced musicians but nice for anyone – CELLISTS or VIOLA PLAYERS or DOUBLE BASSISTS – which sounds good and convincing but is actually a far bit easier than our maestro Bach himself!

SOLO CELLO – VOLUME 1 (9 pieces): https://johnstone-music.com/wp-content/uploads/2020/03/free-johnstone-BREAKING_INTO_BACH-Volume_1-SOLO_CELLO.pdf

SOLO CELLO – VOLUME 2 (9 pieces): https://johnstone-music.com/wp-content/uploads/2020/03/free-johnstone-BREAKING_INTO_BACH-Volume_2-SOLO_CELLO.pdf

SOLO VIOLA – VOLUME 1 (9 pieces): https://johnstone-music.com/wp-content/uploads/2020/03/free-johnstone-Breaking_Into_Bach-VIOLA-Vol_I.pdf

SOLO VIOLA – VOLUME 2 (9 pieces): https://johnstone-music.com/wp-content/uploads/2020/03/free-johnstone-Breaking_Into_Bach-VIOLA-Vol_II.pdf

SOLO DOUBLE BASS – VOLUME 1 (9 pieces): https://johnstone-music.com/wp-content/uploads/2020/03/free-Johnstone-BASS_IN_BACH-SOLO_D_Bass-VOLUME_ONE.pdf

SOLO DOUBLE BASS – VOLUME 2 (9 pieces): https://johnstone-music.com/wp-content/uploads/2020/03/free-Johnstone-BASS_IN_BACH-SOLO_D_Bass-VOLUME_TWO.pdf

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The two Haydn Cello Concertos are a core part of repertoire for ALL advanced cellists; here are free arrangements of an orchestral reduction for one cello, making these first movements performable for just TWO cellists – so also very useful for the cello class!:

HAYDN – Cello Concerto in C Major Hob. VII b:1 (1st Mt)
First movement – moderato
Arranged for Soloist with Rehearsal 2nd Cello by David Johnstone
https://johnstone-music.com/wp-content/uploads/2020/08/HAYDN-Cello_Concerto_C_Major-1st_Mt-TWO_CELLOS.pdf

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HAYDN – Cello Concerto in D Major Hob. VII b:2 (1st Mt)
First movement – Allegro moderato
Arranged for Soloist with Rehearsal 2nd Cello by David Johnstone
https://johnstone-music.com/wp-content/uploads/2020/08/HAYDN-Cello_Concerto_D_Major-1st_Mt-TWO_CELLOS.pdf

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As far as I know, no-one has contemplated this for medium level cellists, again free:

PIAZZOLLA – ADIOS NONINO as a small SONATINA for CELLO AND PIANO for medium level cellists:
Cello Part: https://johnstone-music.com/wp-content/uploads/2020/07/PIAZZOLLA_Johnstone-Adios_Nonino-CELLO-2.pdf
Piano Part: https://johnstone-music.com/wp-content/uploads/2020/07/PIAZZOLLA_Johnstone-Adios_Nonino-PIANO-2.pdf 

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EASIER – CELLO SOLO + CELLO WITH PIANO

Take a look here, most are only €1.00 or even €0.50!

https://johnstone-music.com/product-category/easy-cello-solo-with-piano/?lang=en

In this section a most unusual feature is the EASY CELLO SOLOIST WITH ORCHESTRA SERIES – pieces orchestrated with CELLO SOLOIST AND STRING ORCHESTRA so that the young cellist can have his/her first experiences of playing as soloist with an orchestra!

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EASIER – ENSEMBLES OF CELLOS

Here you can find over 170 pieces for varying cello ensembles for cellists in their first years of playing; up to 8 cellists (octet) are present, but the great majority is for two, three or four cellists. Most are again only €1.00. Go to:
https://johnstone-music.com/product-category/easy-ensembles-of-cellos/?lang=en

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I hope there might be something for many!

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And finally, this group of pieces is not easy, but you might be interested to see this growing section too!
https://johnstone-music.com/product-category/transcripts/violoncello-in-other-groups/?lang=en

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As I always say – enjoy the music!