I does not understand maths successfully and science and SST please help me

It is completely possible to improve in Mathematics, Science and Social Science with regular practice and the right study method. Start by strengthening the basic concepts instead of trying to memorise everything at once.

For Mathematics, practise solved examples first and then attempt questions independently. For Science, understand the concepts, diagrams and important definitions. For SST, make short notes, timelines, maps and revise important points regularly.

Create a simple daily timetable and study these subjects in small sessions. If you consistently practise and clear your doubts, your performance can improve significantly.