There is an application called OpenSIS, which is under GPL license.
The grading system used in OpenSIS has to be modified to work with CBSE(India) schools as per CBSE CCE Guidelines.
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OpenSIS has to be modified to use the CBSE recommended CCE system as well the CBSE defined Report Card format.
Developer will have to find learn about the CCE system and will have to create specifications on his own, based on other CCE enabled systems like Fedena.
Maximum budget is $ 150 and maximum time is 5 days.
After 5 days, there will be a penalty of $ 15 per day, which will be deducted from total project cost.
Please learn about OpenSIS and CBSE CCE and make sure you understand the requirements.