Main demerits of Government of India Act of 1935 are given below: 

1. Preposterous Act: 

According to viewpoint of Indians, there was neither a provision of autonomy nor colonial self governance in this Act. It was preposterous for Indians. 

2. No solution to Indian problems: 

The demand for freedom was rising continuously in India. The British intellectuals and the leaders of labor party considered that the Act did not provide any solution to the Indian problem. 

3. Faulty reservation and tutelage system: 

The provision of reservation and tutelage system provided in the Act of 1935 was a perplan to render the responsible governance in India a failure. These provisions were a device to protect British imperialism in India. The discretionary powers related to minorities, civil services and native states were provided to governor general and provincial governors. The discretionary power given to governor and governor general was against the democratic spirit. 

4. Lack of the right of self determination:

In the Act of 1935, there was no chance of framing a new constitution. The Indians were not given a chance of building their fate. The British parliament and India minister had the right to control India as it was before.