Improving grades in a short time is possible, but it requires a concrete plan, not “trying harder”. Here is a strategy.
Step 1: Identify the source of the problem
A bad grade is a symptom, not the disease. Before you start “studying more”, answer: Do you not understand the material? Do you not finish in time during short tests? Do you not do your homework? Each cause needs a different solution.
Step 2: Focus on gaps, not on current material
Maths, physics and chemistry are sequential subjects: each topic builds on the previous one. If you do not understand equations with one unknown, you will not understand systems of equations. Find the gap and start there.
Step 3: Learn actively
Just reading the textbook is not enough. Solve tasks, make notes in your own words, explain the material to a parent or a friend. We learn by doing, not by looking.
Step 4: Small goals, regular progress
“I will improve in maths” is too big a goal. “This week I will work through operations on fractions” is a plan. Small, achievable goals build motivation and confidence.
Step 5: When is it worth taking tutoring?
If after 3–4 weeks of working on your own there is no progress, it is time for outside help. In a few lessons a tutor can identify a gap that the student themselves missed after months of trying.
Realistic expectations
Improving from a 2 to a 4 in one semester is an ambitious but realistic goal: provided there is steady work. “Quick” grade improvement through cramming before a test gives a short-lived effect and does not solve the problem.