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Look at the rating decision. Then look up the 38CFR info on what they awarded you -vs- what you claimed in the original filing. You know your symptoms, so you should be able to gage if they were right. If not, supplemental  claim with new evidence can be submitted showing why you think they should give you a higher rating. Usually this would lead to something they omitted in the original decision like existing records not cited or something they did not have on hand. Any info that was omitted/discounted has to be noted as such, with the reason in the decision letter if it is in your C-File/VAMC records or Active Duty records. Any documentation you provide must be considered, so this would be the time to get an IMO to back up your claim. Supplemental Claims are much faster (months) than appeals (years), so exhaust that option first. You can file multiple Supplemental Claims as long as you have new and relevant information to include. New information can be professional medical journal studies or articles that rebut the information from C&P examinations. You may need an IMO or professional, published, medical literature/treatise to document your case.