Marathi shikvaicha he =  vaaky  barobar (correct) aahe.

But pl observe the difference between  ' shi kaa y che'  and   '  shik vai  che '

Former is to learn  and lateral is  to teach.  

Ex:  Malaa   Marathi  shi kaa y che  aahe.       Malaa Marath  shik vai che  aahe.

Did you get it ?

Maze naav meera. = Although the sence is good, you may FINISH the sentence with Verb =   MAZE  NAAV  MEERAA  AAHE (IS / BE /AM)

mall Marathi bolaila khoob avadtho  = Almost you are there, tiny mistake. = MALAA   MARATHI   BOLAILAA   KHOO P   AVAD TE.

he mall thodha maithi he mag jastha yeth nahi = IT'S NOT GOOD.  I presume you mean to say :  U don't follow Marathi a lot.  =  MALAA   JAAST  MARATHI  YET  NAAHI.  or   MALAA   MARATHI  THODAY   MAHIT  AAHE,  JAAST  YET  NAAHI.

Keep it up.  =  PRAYTN  CHAALU  THEV.

I am willing to teach you.  You are Welcome.

Marathi shikvaicha he

Maze naav meera.mall Marathi bolaila khoob avadtho he mall thodha maithi he mag jastha yeth nahi

Maze naav meera. Mala Marathi bolaila khup avadte, te mala thodasach mahiti ahe mala jasti yet nahi. this wld be the correct way to say the sentance